Carolina Digital Repository (University of North Carolina at Chapel Hill), 2011
Determination of the prevalence of accumulated antiretroviral drug resistance among persons infec... more Determination of the prevalence of accumulated antiretroviral drug resistance among persons infected with human immunodeficiency virus (HIV) is complicated by the lack of routine measurement in clinical care. By using data from 8 clinic-based cohorts from the North American AIDS Cohort Collaboration on Research and Design, drugresistance mutations from those with genotype tests were determined and scored using the Genotypic Resistance Interpretation Algorithm developed at Stanford University. For each year from 2000 through 2005, the prevalence was calculated using data from the tested subset, assumptions that incorporated clinical knowledge, and multiple imputation methods to yield a complete data set. A total of 9,289 patients contributed data to the analysis; 3,959 had at least 1 viral load above 1,000 copies/mL, of whom 2,962 (75%) had undergone at least 1 genotype test. Using these methods, the authors estimated that the prevalence of accumulated resistance to 2 or more antiretroviral drug classes had increased from 14% in 2000 to 17% in 2005 (P < 0.001). In contrast, the prevalence of resistance in the tested subset declined from 57% to 36% for 2 or more classes. The authors' use of clinical knowledge and multiple imputation methods revealed trends in HIV drug resistance among patients in care that were markedly different from those observed using only data from patients who had undergone genotype tests. antiretroviral therapy, highly active; drug resistance; genotype; HIV Abbreviations: AIDS, acquired immunodeficiency syndrome; ART, antiretroviral therapy; HIV, human immunodeficiency virus; NNRTI, nonnucleoside reverse transcriptase inhibitor; NRTI, nucleoside-analogue reverse transcriptase inhibitor; PI, protease inhibitor.
Carolina Digital Repository (University of North Carolina at Chapel Hill), 2011
Background. Screening for tuberculosis prior to highly active antiretroviral therapy (HAART) init... more Background. Screening for tuberculosis prior to highly active antiretroviral therapy (HAART) initiation is not routinely performed in low-incidence settings. Identifying factors associated with developing tuberculosis after HAART initiation could focus screening efforts. Methods. Sixteen cohorts in the United States and Canada contributed data on persons infected with human immunodeficiency virus (HIV) who initiated HAART December 1995-August 2009. Parametric survival models identified factors associated with tuberculosis occurrence. Results. Of 37 845 persons in the study, 145 were diagnosed with tuberculosis after HAART initiation. Tuberculosis risk was highest in the first 3 months of HAART (20 cases; 215 cases per 100 000 person-years; 95% confidence interval [CI]: 131-333 per 100 000 person-years). In a multivariate Weibull proportional hazards model, baseline CD41 lymphocyte count ,200, black race, other nonwhite race, Hispanic ethnicity, and history of injection drug use were independently associated with tuberculosis risk. In addition, in a piece-wise Weibull model, increased baseline HIV-1 RNA was associated with increased tuberculosis risk in the first 3 months; male sex tended to be associated with increased risk. Conclusions. Screening for active tuberculosis prior to HAART initiation should be targeted to persons with baseline CD4 ,200 lymphocytes/mm 3 or increased HIV-1 RNA, persons of nonwhite race or Hispanic ethnicity, history of injection drug use, and possibly male sex.
Study Design-Retrospective analysis of nationwide Veterans Health Administration (VA) clinical an... more Study Design-Retrospective analysis of nationwide Veterans Health Administration (VA) clinical and administrative data.
Background. Human immunodeficiency virus (HIV) coinfection accelerates the rate of liver disease ... more Background. Human immunodeficiency virus (HIV) coinfection accelerates the rate of liver disease outcomes in individuals chronically infected with hepatitis C virus (HCV). It remains unclear to what degree combination antiretroviral therapy (ART) protects against HCV-associated liver failure. Methods. We evaluated 10 090 HIV/HCV-coinfected males from the Veterans Aging Cohort Study Virtual Cohort, who had not initiated ART at entry, for incident hepatic decompensation between 1996 and 2010. We defined ART initiation as the first pharmacy fill date of a qualifying ART regimen of ≥3 drugs from ≥2 classes. Hepatic decompensation was defined as the first occurrence of 1 hospital discharge diagnosis or 2 outpatient diagnoses for ascites, spontaneous bacterial peritonitis, or esophageal variceal hemorrhage. To account for potential confounding by indication, marginal structural models were used to estimate hazard ratios (HRs) of hepatic decompensation, comparing initiation of ART to noninitiation. Results. We observed 645 hepatic decompensation events in 46 444 person-years of follow-up (incidence rate, 1.4/100 person-years). Coinfected patients who initiated ART had a significantly reduced rate of hepatic decompensation relative to noninitiators (HR = 0.72; 95% confidence interval [CI], .54-.94). When we removed individuals with HIV RNA ≤400 copies/mL at baseline from the analysis (assuming that they may have received undocumented ART at entry), the hazard ratio became more pronounced (HR = 0.59; 95% CI, .43-.82). Conclusions. Initiation of ART significantly reduced the rate of hepatic decompensation by 28%-41% on average. These results suggest that ART should be administered to HIV/HCV-coinfected patients to lower the risk of end-stage liver disease.
Background. Anal cancer is one of the most common cancers affecting individuals infected with hum... more Background. Anal cancer is one of the most common cancers affecting individuals infected with human immunodeficiency virus (HIV), although few have evaluated rates separately for men who have sex with men (MSM), other men, and women. There are also conflicting data regarding calendar trends. Methods. In a study involving 13 cohorts from North America with follow-up between 1996 and 2007, we compared anal cancer incidence rates among 34 189 HIV-infected (55% MSM, 19% other men, 26% women) and 114 260 HIV-uninfected individuals (90% men). Results. Among men, the unadjusted anal cancer incidence rates per 100 000 person-years were 131 for HIVinfected MSM, 46 for other HIV-infected men, and 2 for HIV-uninfected men, corresponding to demographically adjusted rate ratios (RRs) of 80.3 (95% confidence interval [CI], 42.7-151.1) for HIV-infected MSM and 26.7 (95% CI, 11.5-61.7) for other HIV-infected men compared with HIV-uninfected men. HIV-infected women had an anal cancer rate of 30/100 000 person-years, and no cases were observed for HIV-uninfected women. In a multivariable Poisson regression model, among HIV-infected individuals, the risk was higher for MSM compared with other men (RR, 3.3; 95% CI, 1.8-6.0), but no difference was observed comparing women with other men (RR, 1.0; 95% CI, 0.5-2.2). In comparison with the period 2000-2003, HIV-infected individuals had an adjusted RR of 0.5 (95% CI, .3-.9) in 1996-1999 and 0.9 (95% CI, .6-1.2) in 2004-2007. Conclusions. Anal cancer rates were substantially higher for HIV-infected MSM, other men, and women compared with HIV-uninfected individuals, suggesting a need for universal prevention efforts. Rates increased after the early antiretroviral therapy era and then plateaued. With the dramatic decline in human immunodeficiency virus (HIV)-related mortality resulting from advances in combination antiretroviral therapy (ART) and the longer life expectancy and aging of HIV-infected persons, there is growing concern about an increased burden of certain cancers, particularly infection-related cancers such as anal cancer. Meta-analyses have reported that anal cancer incidence rates are 30 times as high for HIV-infected individuals compared with the general population [1, 2], although incidence rate estimates from individual studies have varied widely from 18 to 149 cases per 100 000 person-years . Understanding the factors that contribute to the variability in anal cancer incidence rates in HIV-infected persons is critical for targeting screening and prevention
Medical intensive care unit (MICU) admissions have been declining in people with HIV infection (P... more Medical intensive care unit (MICU) admissions have been declining in people with HIV infection (PWH), but frequency of outpatient polypharmacy (prescription of �5 chronic medications) has increased. Among those hospitalized, we examined whether outpatient polypharmacy is associated with subsequent 1-year MICU admission or 10-year all-cause mortality, and if the association varies by HIV status. Retrospective cohort study. Using a national electronic health record cohort of Veterans in care, we ascertained outpatient polypharmacy during fiscal year (FY) 2009 and followed patients for 1-year MICU admission and 10-year mortality. We assessed associations of any polypharmacy (yes/no and categorized �4, 5-7, 8-9, and �10 medications) with 1-year MICU admission and 10year mortality using logistic and Cox regressions, respectively, adjusted for demographics, HIV status, substance use, and severity of illness.
Background: Inflammation in human immunodeficiency virus (HIV)-infected patients is associated wi... more Background: Inflammation in human immunodeficiency virus (HIV)-infected patients is associated with poorer health outcomes. Whether inflammation as measured by the neutrophil-to-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR) adds information to existing prognostic indices is not known. Methods: We analyzed data from 2000 to 2012 in the Veterans Aging Cohort Study (VACS), overall and stratified by HIV/hepatitis C virus status (n = 89 786). We randomly selected a visit date at which all laboratory values of interest were available within 180 days; participants with HIV received at least 1 year of antiretroviral therapy. We followed patients for (1) mortality and (2) hepatic decompensation (HD) and analyzed associations using Cox regression, adjusted for a validated mortality risk index (VACS Index 2.0). In VACS Biomarker Cohort, we considered correlation with biomarkers of inflammation: interleukin-6, D-dimer, and soluble CD-14. Results: Neutrophil-to-lymphocyte ratio and PLR demonstrated strong unadjusted associations with mortality (P < .0001) and HD (P < .0001) and were weakly correlated with other inflammatory biomarkers. Although NLR remained statistically independent for mortality, as did PLR for HD, the addition of NLR and PLR to the VACS Index 2.0 did not result in significant improvement in discrimination compared with VACS Index 2.0 alone for mortality (C-statistic 0.767 vs 0.758) or for HD (C-statistic 0.805 vs 0.801). Conclusions: Neutrophil-to-lymphocyte ratio and PLR were strongly associated with mortality and HD and weakly correlated with inflammatory biomarkers. However, most of their association was explained by VACS Index 2.0. Addition of NLR and PLR to VACS 2.0 did not substantially improve discrimination for either outcome.
Background: Hepatic steatosis is prevalent in Western countries, but few studies have evaluated w... more Background: Hepatic steatosis is prevalent in Western countries, but few studies have evaluated whether the frequency and severity of steatosis are greater in the setting of HIV infection. We compared the prevalence and severity of hepatic steatosis between HIV-infected (HIV+) and uninfected persons and identified factors associated with greater steatosis severity within both groups. Methods: We performed a cross-sectional study among participants without cardiovascular disease who participated in a substudy of the Veterans Aging Cohort Study. Hepatic steatosis was defined by noncontrast computed tomography (CT) liver-to-spleen (L/S) attenuation ratio < 1.0. Multivariable linear regression was used to: 1) evaluate the association between HIV infection and severity of hepatic steatosis, as measured by absolute liver attenuation, and 2) identify factors associated with greater severity of steatosis, by HIV status. Results: Among 268 participants (median age, 55 years; 99% male; 79% black; 23% obese; 64% HIV+ [91% on antiretroviral therapy]), the overall prevalence of steatosis was 7.8% and was similar between HIV+ and uninfected individuals (13 [7.6%] versus 8 [8.2%], respectively; p = 0.85). Participants with HIV, the majority of whom received antiretroviral therapy, had a higher mean absolute liver attenuation (mean difference, 5.68 Hounsfield units; p < 0.001), correlating with lesser hepatic steatosis severity, compared to uninfected participants. After adjusting for covariates, only advanced hepatic fibrosis was associated with greater severity of steatosis in HIV+ persons (p = 0.03) and uninfected individuals (p < 0.001). In this sample of participants without cardiovascular disease, the prevalence of hepatic steatosis by noncontrast abdominal CT was not different by HIV status. Increasing severity of steatosis was independently associated with advanced hepatic fibrosis in both groups.
Background-Both HIV and depression are associated with increased heart failure (HF) risk. Depress... more Background-Both HIV and depression are associated with increased heart failure (HF) risk. Depression, a common comorbidity, may further increase the risk of HF among HIV+ adults. We assessed the association between HIV, depression and incident HF.
medRxiv (Cold Spring Harbor Laboratory), May 18, 2020
Background: There is growing concern that racial and ethnic minority communities around the world... more Background: There is growing concern that racial and ethnic minority communities around the world are experiencing a disproportionate burden of morbidity and mortality from symptomatic SARS-Cov-2 infection or coronavirus disease 2019 (Covid-19). Most studies investigating racial and ethnic disparities to date have focused on hospitalized patients or have not characterized who received testing or those who tested positive for Covid-19. Objective: To compare patterns of testing and test results for coronavirus 2019 (Covid-19) and subsequent mortality by race and ethnicity in the largest integrated healthcare system in the United States.
Background Adults with HIV have an increased burden of non-AIDS-defining cancers, myocardial infa... more Background Adults with HIV have an increased burden of non-AIDS-defining cancers, myocardial infarction, end-stage liver disease, and end-stage renal disease. The objective of this study was to estimate the population attributable fractions (PAFs) of preventable or modifiable HIV-related and traditional risk factors for non-AIDS-defining cancers, myocardial infarction, end-stage liver disease, and end-stage renal disease outcomes. We included participants receiving care in academic and community-based outpatient HIV clinical cohorts in the USA and Canada from Jan 1, 2000, to Dec 31, 2014, who contributed to the North American AIDS Cohort Collaboration on Research and Design and who had validated non-AIDS-defining c ancers, m yocardial i nfarction, e nd-stage l iver disease, or end-stage renal disease outcomes. Traditional risk factors were tobacco smoking, hypertension, elevated total cholesterol, type 2 diabetes, renal impairment (stage 4 chronic kidney disease), and hepatitis C virus and hepatitis B virus infections. HIV-related risk factors were low CD4 count (<200 cells per µL), detectable plasma HIV RNA (>400 copies per mL), and history of a clinical AIDS diagnosis. PAFs and 95% CIs were estimated to quantify the proportion of outcomes that could be avoided if the risk factor was prevented. Findings In each of the study populations for the four outcomes (1405 of 61 500 had non-AIDS-defining cancer, 347 of 29 515 had myocardial infarctions, 387 of 35 044 had end-stage liver disease events, and 255 of 35 620 had end-stage renal disease events), about 17% were older than 50 years at study entry, about 50% were non-white, and about 80% were men. Preventing smoking would avoid 24% (95% CI 13-35) of these cancers and 37% (7-66) of the myocardial infarctions. Preventing elevated total cholesterol and hypertension would avoid the greatest proportion of myocardial infarctions: 44% (30-58) for cholesterol and 42% (28-56) for hypertension. For liver disease, the PAF was greatest for hepatitis C infection (33%; 95% CI 17-48). For renal disease, the PAF was greatest for hypertension (39%; 26-51) followed by elevated total cholesterol (22%; 13-31), detectable HIV RNA (19; 9-31), and low CD4 cell count (13%; 4-21). The substantial proportion of non-AIDS-defining cancers, myocardial infarction, end-stage liver disease, and end-stage renal disease outcomes that could be prevented with interventions on traditional risk factors elevates the importance of screening for these risk factors, improving the effectiveness of prevention (or modification) of these risk factors, and creating sustainable care models to implement such interventions during the decades of life of adults living with HIV who are receiving care.
There is growing concern that racial and ethnic minority communities around the world are experie... more There is growing concern that racial and ethnic minority communities around the world are experiencing a disproportionate burden of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and coronavirus disease 2019 (COVID-19). We investigated racial and ethnic disparities in patterns of COVID-19 testing (i.e., who received testing and who tested positive) and subsequent mortality in the largest integrated healthcare system in the United States. This retrospective cohort study included 5,834,543 individuals receiving care in the US Department of Veterans Affairs; most (91%) were men, 74% were non-Hispanic White (White), 19% were non-Hispanic Black (Black), and 7% were Hispanic. We evaluated
Carolina Digital Repository (University of North Carolina at Chapel Hill), 2016
Background: When a clinical treatment fails or shows suboptimal results, the question of when to ... more Background: When a clinical treatment fails or shows suboptimal results, the question of when to switch to another treatment arises. Treatment switching strategies are often dynamic because the time of switching depends on the evolution of an individual's time-varying covariates. Dynamic strategies can be directly compared in randomized trials. For example, HIV-infected individuals receiving antiretroviral therapy could be randomized to switching therapy within 90 days of HIV-1 RNA crossing above a threshold of either 400 copies/ml (tight-control strategy) or 1000 copies/ml (loose-control strategy). Methods: We review an approach to emulate a randomized trial of dynamic switching strategies using observational data from the Antiretroviral Therapy Cohort Collaboration, the Centers for AIDS Research Network of Integrated Clinical Systems and the HIV-CAUSAL Collaboration. We estimated the comparative effect of tight-control vs. loose-control strategies on death and AIDS or death via inverse-probability weighting. Results: Of 43 803 individuals who initiated an eligible antiretroviral therapy regimen in 2002 or later, 2001 met the baseline inclusion criteria for the mortality analysis and 1641 for the AIDS or death analysis. There were 21 deaths and 33 AIDS or death events in the tight-control group, and 28 deaths and 41 AIDS or death events in the loose-control group. Compared with tight control, the adjusted hazard ratios (95% confidence interval) for loose control were 1.10 (0.73, 1.66) for death, and 1.04 (0.86, 1.27) for AIDS or death. Conclusions: Although our effective sample sizes were small and our estimates imprecise, the described methodological approach can serve as an example for future analyses.
Background: At-risk levels of alcohol use threaten the health of patients with HIV (PWH), yet evi... more Background: At-risk levels of alcohol use threaten the health of patients with HIV (PWH), yet evidence-based strategies to decrease alcohol use and improve HIV-related outcomes in this population are lacking. We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcohol use and HIV outcomes among PWH and at-risk alcohol use. : In this multi-site, randomized trial conducted between January 28, 2013 through July 14, 2017, we enrolled PWH and at-risk alcohol use [defined as alcohol consumption of ≥ 14 drinks per week or ≥ 4 drinks per occasion in men ≤ 65 years old or ≥ 7 drinks per week or ≥ 3 drinks per occasion in women or men > 65 years old]. ISAT (n = 46) involved: Step 1-Brief Negotiated Interview with telephone booster, Step 2-Motivational Enhancement Therapy, and Step 3-Addiction Physician Management. Treatment as usual (TAU) (n = 47) involved receipt of a health handout plus routine care. Analyses were conducted based on intention to treat principles. Results: Despite a multi-pronged approach, we only recruited 37% of the target population (n = 93/254). Among ISAT participants, 50% advanced to Step 2, among whom 57% advanced to Step 3. Participants randomized to ISAT and TAU had no observed difference in drinks per week over the past 30 days at week 24 (primary outcome) [least square means (Ls mean) (95% CI) = 8.8 vs. 10.6; adjusted mean difference (AMD) (95% CI) = -0.4 (-3.9, 3.0)]. An insufficient number of patients were interested in participating in the trial. Efforts to enhance motivation of PWH with at-risk alcohol use to engage in alcohol-related research and build upon ISAT are needed.
Background We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcoho... more Background We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcohol use and HIV outcomes among patients living with HIV and alcohol use disorder. Methods In this multisite, randomised controlled trial, conducted in five Veterans Affairs-based HIV clinics in the USA (Atlanta, GA; Brooklyn-Manhattan, NY; Dallas and Houston, TX; and Washington, DC), we recruited people living with HIV and an alcohol use disorder who were not otherwise receiving formal alcohol treatment. Patients were eligible if they were aged 18 years or older, HIV positive, English speaking, and met criteria for alcohol use disorder by the Diagnostic and Statistical Manual for Mental Disorders-IV criteria for alcohol abuse or dependence. Key exclusion criteria included if the patient was acutely suicidal or had a psychiatric condition that affected their ability to participate in counselling interventions, or if they had any medical conditions that would preclude completing the study or cause harm during the course of the study. Using a web-based clinical trial management system, we randomly assigned participants (1:1) to receive ISAT or treatment as usual; patients, investigators, and clinicians were unmasked to allocation. ISAT involved three steps: step 1, addiction physician management, comprising eight sessions; step 2, addiction physician management plus motivational enhancement therapy, comprising four sessions; and step 3, specialty referral. Participants were stepped up at weeks 4 and 12 if they exceeded a priori drinking criteria. Treatment as usual involved referral to substance use treatment services. The primary outcome was number of drinks per week over the past 30 days at week 24 by use of the timeline followback method, assessed in the intention-to-treat population. Adverse events were tracked throughout the study period in all randomly assigned participants. This trial is registered at ClinicalTrials.gov, number NCT01410123.
Background We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcoho... more Background We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcohol use and HIV outcomes among patients living with HIV and alcohol use disorder. Methods In this multisite, randomised controlled trial, conducted in five Veterans Affairs-based HIV clinics in the USA (Atlanta, GA; Brooklyn-Manhattan, NY; Dallas and Houston, TX; and Washington, DC), we recruited people living with HIV and an alcohol use disorder who were not otherwise receiving formal alcohol treatment. Patients were eligible if they were aged 18 years or older, HIV positive, English speaking, and met criteria for alcohol use disorder by the Diagnostic and Statistical Manual for Mental Disorders-IV criteria for alcohol abuse or dependence. Key exclusion criteria included if the patient was acutely suicidal or had a psychiatric condition that affected their ability to participate in counselling interventions, or if they had any medical conditions that would preclude completing the study or cause harm during the course of the study. Using a web-based clinical trial management system, we randomly assigned participants (1:1) to receive ISAT or treatment as usual; patients, investigators, and clinicians were unmasked to allocation. ISAT involved three steps: step 1, addiction physician management, comprising eight sessions; step 2, addiction physician management plus motivational enhancement therapy, comprising four sessions; and step 3, specialty referral. Participants were stepped up at weeks 4 and 12 if they exceeded a priori drinking criteria. Treatment as usual involved referral to substance use treatment services. The primary outcome was number of drinks per week over the past 30 days at week 24 by use of the timeline followback method, assessed in the intention-to-treat population. Adverse events were tracked throughout the study period in all randomly assigned participants. This trial is registered at ClinicalTrials.gov, number NCT01410123.
Carolina Digital Repository (University of North Carolina at Chapel Hill), 2016
Background. Human immunodeficiency virus (HIV)-infected patients coinfected with hepatitis B (HBV... more Background. Human immunodeficiency virus (HIV)-infected patients coinfected with hepatitis B (HBV) and C (HCV) viruses are at increased risk of end-stage liver disease (ESLD). Whether modern antiretroviral therapy has reduced ESLD risk is unknown. Methods. Twelve clinical cohorts in the United States and Canada participating in the North American AIDS Cohort Collaboration on Research and Design validated ESLD events from 1996 to 2010. ESLD incidence rates and rate ratios according to hepatitis status adjusted for age, sex, race, cohort, time-updated CD4 cell count and HIV RNA were estimated in calendar periods corresponding to major changes in antiretroviral therapy: early (1996)(1997)(1998)(1999)(2000), middle (2001)(2002)(2003)(2004)(2005), and modern (2006-2010) eras. Results. Among 34 119 HIV-infected adults followed for 129 818 person-years, 380 incident ESLD outcomes occurred. ESLD incidence ( per 1000 person-years) was highest in triply infected (11.57) followed by HBV-(8.72) and HCV-(6.10) coinfected vs 1.27 in HIV-monoinfected patients. Adjusted incidence rate ratios (95% confidence intervals) comparing the modern to the early antiretroviral era were 0.95 (.61-1.47) for HCV, 0.95 (.40-2.26) for HBV, and 1.52 (.46-5.02) for triply infected patients. Use of antiretrovirals dually activity against HBV increased over time. However, in the modern era, 35% of HBV-coinfected patients were not receiving tenofovir. There was little use of HCV therapy. Conclusions. Despite increasing use of antiretrovirals, no clear reduction in ESLD risk was observed over 15 years. Treatment with direct-acting antivirals for HCV and wider use of tenofovir-based regimens for HBV should be prioritized for coinfected patients.
e16560Background: Little is known about how the biology of prostate cancer in HIV+ men compares t... more e16560Background: Little is known about how the biology of prostate cancer in HIV+ men compares to that of uninfected men. The purpose of our study was to compare the Gleason grade (GL) of prostate...
In this study, we evaluated fracture incidence over a 10-year period among men with and without o... more In this study, we evaluated fracture incidence over a 10-year period among men with and without osteomyelitis from the Veterans Aging Cohort Study. Fracture incidence was significantly higher among those with osteomyelitis at all osteoporotic fracture sites after adjusting for key related risk factors. Future prospective studies are warranted.
Carolina Digital Repository (University of North Carolina at Chapel Hill), 2011
Determination of the prevalence of accumulated antiretroviral drug resistance among persons infec... more Determination of the prevalence of accumulated antiretroviral drug resistance among persons infected with human immunodeficiency virus (HIV) is complicated by the lack of routine measurement in clinical care. By using data from 8 clinic-based cohorts from the North American AIDS Cohort Collaboration on Research and Design, drugresistance mutations from those with genotype tests were determined and scored using the Genotypic Resistance Interpretation Algorithm developed at Stanford University. For each year from 2000 through 2005, the prevalence was calculated using data from the tested subset, assumptions that incorporated clinical knowledge, and multiple imputation methods to yield a complete data set. A total of 9,289 patients contributed data to the analysis; 3,959 had at least 1 viral load above 1,000 copies/mL, of whom 2,962 (75%) had undergone at least 1 genotype test. Using these methods, the authors estimated that the prevalence of accumulated resistance to 2 or more antiretroviral drug classes had increased from 14% in 2000 to 17% in 2005 (P < 0.001). In contrast, the prevalence of resistance in the tested subset declined from 57% to 36% for 2 or more classes. The authors' use of clinical knowledge and multiple imputation methods revealed trends in HIV drug resistance among patients in care that were markedly different from those observed using only data from patients who had undergone genotype tests. antiretroviral therapy, highly active; drug resistance; genotype; HIV Abbreviations: AIDS, acquired immunodeficiency syndrome; ART, antiretroviral therapy; HIV, human immunodeficiency virus; NNRTI, nonnucleoside reverse transcriptase inhibitor; NRTI, nucleoside-analogue reverse transcriptase inhibitor; PI, protease inhibitor.
Carolina Digital Repository (University of North Carolina at Chapel Hill), 2011
Background. Screening for tuberculosis prior to highly active antiretroviral therapy (HAART) init... more Background. Screening for tuberculosis prior to highly active antiretroviral therapy (HAART) initiation is not routinely performed in low-incidence settings. Identifying factors associated with developing tuberculosis after HAART initiation could focus screening efforts. Methods. Sixteen cohorts in the United States and Canada contributed data on persons infected with human immunodeficiency virus (HIV) who initiated HAART December 1995-August 2009. Parametric survival models identified factors associated with tuberculosis occurrence. Results. Of 37 845 persons in the study, 145 were diagnosed with tuberculosis after HAART initiation. Tuberculosis risk was highest in the first 3 months of HAART (20 cases; 215 cases per 100 000 person-years; 95% confidence interval [CI]: 131-333 per 100 000 person-years). In a multivariate Weibull proportional hazards model, baseline CD41 lymphocyte count ,200, black race, other nonwhite race, Hispanic ethnicity, and history of injection drug use were independently associated with tuberculosis risk. In addition, in a piece-wise Weibull model, increased baseline HIV-1 RNA was associated with increased tuberculosis risk in the first 3 months; male sex tended to be associated with increased risk. Conclusions. Screening for active tuberculosis prior to HAART initiation should be targeted to persons with baseline CD4 ,200 lymphocytes/mm 3 or increased HIV-1 RNA, persons of nonwhite race or Hispanic ethnicity, history of injection drug use, and possibly male sex.
Study Design-Retrospective analysis of nationwide Veterans Health Administration (VA) clinical an... more Study Design-Retrospective analysis of nationwide Veterans Health Administration (VA) clinical and administrative data.
Background. Human immunodeficiency virus (HIV) coinfection accelerates the rate of liver disease ... more Background. Human immunodeficiency virus (HIV) coinfection accelerates the rate of liver disease outcomes in individuals chronically infected with hepatitis C virus (HCV). It remains unclear to what degree combination antiretroviral therapy (ART) protects against HCV-associated liver failure. Methods. We evaluated 10 090 HIV/HCV-coinfected males from the Veterans Aging Cohort Study Virtual Cohort, who had not initiated ART at entry, for incident hepatic decompensation between 1996 and 2010. We defined ART initiation as the first pharmacy fill date of a qualifying ART regimen of ≥3 drugs from ≥2 classes. Hepatic decompensation was defined as the first occurrence of 1 hospital discharge diagnosis or 2 outpatient diagnoses for ascites, spontaneous bacterial peritonitis, or esophageal variceal hemorrhage. To account for potential confounding by indication, marginal structural models were used to estimate hazard ratios (HRs) of hepatic decompensation, comparing initiation of ART to noninitiation. Results. We observed 645 hepatic decompensation events in 46 444 person-years of follow-up (incidence rate, 1.4/100 person-years). Coinfected patients who initiated ART had a significantly reduced rate of hepatic decompensation relative to noninitiators (HR = 0.72; 95% confidence interval [CI], .54-.94). When we removed individuals with HIV RNA ≤400 copies/mL at baseline from the analysis (assuming that they may have received undocumented ART at entry), the hazard ratio became more pronounced (HR = 0.59; 95% CI, .43-.82). Conclusions. Initiation of ART significantly reduced the rate of hepatic decompensation by 28%-41% on average. These results suggest that ART should be administered to HIV/HCV-coinfected patients to lower the risk of end-stage liver disease.
Background. Anal cancer is one of the most common cancers affecting individuals infected with hum... more Background. Anal cancer is one of the most common cancers affecting individuals infected with human immunodeficiency virus (HIV), although few have evaluated rates separately for men who have sex with men (MSM), other men, and women. There are also conflicting data regarding calendar trends. Methods. In a study involving 13 cohorts from North America with follow-up between 1996 and 2007, we compared anal cancer incidence rates among 34 189 HIV-infected (55% MSM, 19% other men, 26% women) and 114 260 HIV-uninfected individuals (90% men). Results. Among men, the unadjusted anal cancer incidence rates per 100 000 person-years were 131 for HIVinfected MSM, 46 for other HIV-infected men, and 2 for HIV-uninfected men, corresponding to demographically adjusted rate ratios (RRs) of 80.3 (95% confidence interval [CI], 42.7-151.1) for HIV-infected MSM and 26.7 (95% CI, 11.5-61.7) for other HIV-infected men compared with HIV-uninfected men. HIV-infected women had an anal cancer rate of 30/100 000 person-years, and no cases were observed for HIV-uninfected women. In a multivariable Poisson regression model, among HIV-infected individuals, the risk was higher for MSM compared with other men (RR, 3.3; 95% CI, 1.8-6.0), but no difference was observed comparing women with other men (RR, 1.0; 95% CI, 0.5-2.2). In comparison with the period 2000-2003, HIV-infected individuals had an adjusted RR of 0.5 (95% CI, .3-.9) in 1996-1999 and 0.9 (95% CI, .6-1.2) in 2004-2007. Conclusions. Anal cancer rates were substantially higher for HIV-infected MSM, other men, and women compared with HIV-uninfected individuals, suggesting a need for universal prevention efforts. Rates increased after the early antiretroviral therapy era and then plateaued. With the dramatic decline in human immunodeficiency virus (HIV)-related mortality resulting from advances in combination antiretroviral therapy (ART) and the longer life expectancy and aging of HIV-infected persons, there is growing concern about an increased burden of certain cancers, particularly infection-related cancers such as anal cancer. Meta-analyses have reported that anal cancer incidence rates are 30 times as high for HIV-infected individuals compared with the general population [1, 2], although incidence rate estimates from individual studies have varied widely from 18 to 149 cases per 100 000 person-years . Understanding the factors that contribute to the variability in anal cancer incidence rates in HIV-infected persons is critical for targeting screening and prevention
Medical intensive care unit (MICU) admissions have been declining in people with HIV infection (P... more Medical intensive care unit (MICU) admissions have been declining in people with HIV infection (PWH), but frequency of outpatient polypharmacy (prescription of �5 chronic medications) has increased. Among those hospitalized, we examined whether outpatient polypharmacy is associated with subsequent 1-year MICU admission or 10-year all-cause mortality, and if the association varies by HIV status. Retrospective cohort study. Using a national electronic health record cohort of Veterans in care, we ascertained outpatient polypharmacy during fiscal year (FY) 2009 and followed patients for 1-year MICU admission and 10-year mortality. We assessed associations of any polypharmacy (yes/no and categorized �4, 5-7, 8-9, and �10 medications) with 1-year MICU admission and 10year mortality using logistic and Cox regressions, respectively, adjusted for demographics, HIV status, substance use, and severity of illness.
Background: Inflammation in human immunodeficiency virus (HIV)-infected patients is associated wi... more Background: Inflammation in human immunodeficiency virus (HIV)-infected patients is associated with poorer health outcomes. Whether inflammation as measured by the neutrophil-to-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR) adds information to existing prognostic indices is not known. Methods: We analyzed data from 2000 to 2012 in the Veterans Aging Cohort Study (VACS), overall and stratified by HIV/hepatitis C virus status (n = 89 786). We randomly selected a visit date at which all laboratory values of interest were available within 180 days; participants with HIV received at least 1 year of antiretroviral therapy. We followed patients for (1) mortality and (2) hepatic decompensation (HD) and analyzed associations using Cox regression, adjusted for a validated mortality risk index (VACS Index 2.0). In VACS Biomarker Cohort, we considered correlation with biomarkers of inflammation: interleukin-6, D-dimer, and soluble CD-14. Results: Neutrophil-to-lymphocyte ratio and PLR demonstrated strong unadjusted associations with mortality (P < .0001) and HD (P < .0001) and were weakly correlated with other inflammatory biomarkers. Although NLR remained statistically independent for mortality, as did PLR for HD, the addition of NLR and PLR to the VACS Index 2.0 did not result in significant improvement in discrimination compared with VACS Index 2.0 alone for mortality (C-statistic 0.767 vs 0.758) or for HD (C-statistic 0.805 vs 0.801). Conclusions: Neutrophil-to-lymphocyte ratio and PLR were strongly associated with mortality and HD and weakly correlated with inflammatory biomarkers. However, most of their association was explained by VACS Index 2.0. Addition of NLR and PLR to VACS 2.0 did not substantially improve discrimination for either outcome.
Background: Hepatic steatosis is prevalent in Western countries, but few studies have evaluated w... more Background: Hepatic steatosis is prevalent in Western countries, but few studies have evaluated whether the frequency and severity of steatosis are greater in the setting of HIV infection. We compared the prevalence and severity of hepatic steatosis between HIV-infected (HIV+) and uninfected persons and identified factors associated with greater steatosis severity within both groups. Methods: We performed a cross-sectional study among participants without cardiovascular disease who participated in a substudy of the Veterans Aging Cohort Study. Hepatic steatosis was defined by noncontrast computed tomography (CT) liver-to-spleen (L/S) attenuation ratio < 1.0. Multivariable linear regression was used to: 1) evaluate the association between HIV infection and severity of hepatic steatosis, as measured by absolute liver attenuation, and 2) identify factors associated with greater severity of steatosis, by HIV status. Results: Among 268 participants (median age, 55 years; 99% male; 79% black; 23% obese; 64% HIV+ [91% on antiretroviral therapy]), the overall prevalence of steatosis was 7.8% and was similar between HIV+ and uninfected individuals (13 [7.6%] versus 8 [8.2%], respectively; p = 0.85). Participants with HIV, the majority of whom received antiretroviral therapy, had a higher mean absolute liver attenuation (mean difference, 5.68 Hounsfield units; p < 0.001), correlating with lesser hepatic steatosis severity, compared to uninfected participants. After adjusting for covariates, only advanced hepatic fibrosis was associated with greater severity of steatosis in HIV+ persons (p = 0.03) and uninfected individuals (p < 0.001). In this sample of participants without cardiovascular disease, the prevalence of hepatic steatosis by noncontrast abdominal CT was not different by HIV status. Increasing severity of steatosis was independently associated with advanced hepatic fibrosis in both groups.
Background-Both HIV and depression are associated with increased heart failure (HF) risk. Depress... more Background-Both HIV and depression are associated with increased heart failure (HF) risk. Depression, a common comorbidity, may further increase the risk of HF among HIV+ adults. We assessed the association between HIV, depression and incident HF.
medRxiv (Cold Spring Harbor Laboratory), May 18, 2020
Background: There is growing concern that racial and ethnic minority communities around the world... more Background: There is growing concern that racial and ethnic minority communities around the world are experiencing a disproportionate burden of morbidity and mortality from symptomatic SARS-Cov-2 infection or coronavirus disease 2019 (Covid-19). Most studies investigating racial and ethnic disparities to date have focused on hospitalized patients or have not characterized who received testing or those who tested positive for Covid-19. Objective: To compare patterns of testing and test results for coronavirus 2019 (Covid-19) and subsequent mortality by race and ethnicity in the largest integrated healthcare system in the United States.
Background Adults with HIV have an increased burden of non-AIDS-defining cancers, myocardial infa... more Background Adults with HIV have an increased burden of non-AIDS-defining cancers, myocardial infarction, end-stage liver disease, and end-stage renal disease. The objective of this study was to estimate the population attributable fractions (PAFs) of preventable or modifiable HIV-related and traditional risk factors for non-AIDS-defining cancers, myocardial infarction, end-stage liver disease, and end-stage renal disease outcomes. We included participants receiving care in academic and community-based outpatient HIV clinical cohorts in the USA and Canada from Jan 1, 2000, to Dec 31, 2014, who contributed to the North American AIDS Cohort Collaboration on Research and Design and who had validated non-AIDS-defining c ancers, m yocardial i nfarction, e nd-stage l iver disease, or end-stage renal disease outcomes. Traditional risk factors were tobacco smoking, hypertension, elevated total cholesterol, type 2 diabetes, renal impairment (stage 4 chronic kidney disease), and hepatitis C virus and hepatitis B virus infections. HIV-related risk factors were low CD4 count (<200 cells per µL), detectable plasma HIV RNA (>400 copies per mL), and history of a clinical AIDS diagnosis. PAFs and 95% CIs were estimated to quantify the proportion of outcomes that could be avoided if the risk factor was prevented. Findings In each of the study populations for the four outcomes (1405 of 61 500 had non-AIDS-defining cancer, 347 of 29 515 had myocardial infarctions, 387 of 35 044 had end-stage liver disease events, and 255 of 35 620 had end-stage renal disease events), about 17% were older than 50 years at study entry, about 50% were non-white, and about 80% were men. Preventing smoking would avoid 24% (95% CI 13-35) of these cancers and 37% (7-66) of the myocardial infarctions. Preventing elevated total cholesterol and hypertension would avoid the greatest proportion of myocardial infarctions: 44% (30-58) for cholesterol and 42% (28-56) for hypertension. For liver disease, the PAF was greatest for hepatitis C infection (33%; 95% CI 17-48). For renal disease, the PAF was greatest for hypertension (39%; 26-51) followed by elevated total cholesterol (22%; 13-31), detectable HIV RNA (19; 9-31), and low CD4 cell count (13%; 4-21). The substantial proportion of non-AIDS-defining cancers, myocardial infarction, end-stage liver disease, and end-stage renal disease outcomes that could be prevented with interventions on traditional risk factors elevates the importance of screening for these risk factors, improving the effectiveness of prevention (or modification) of these risk factors, and creating sustainable care models to implement such interventions during the decades of life of adults living with HIV who are receiving care.
There is growing concern that racial and ethnic minority communities around the world are experie... more There is growing concern that racial and ethnic minority communities around the world are experiencing a disproportionate burden of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and coronavirus disease 2019 (COVID-19). We investigated racial and ethnic disparities in patterns of COVID-19 testing (i.e., who received testing and who tested positive) and subsequent mortality in the largest integrated healthcare system in the United States. This retrospective cohort study included 5,834,543 individuals receiving care in the US Department of Veterans Affairs; most (91%) were men, 74% were non-Hispanic White (White), 19% were non-Hispanic Black (Black), and 7% were Hispanic. We evaluated
Carolina Digital Repository (University of North Carolina at Chapel Hill), 2016
Background: When a clinical treatment fails or shows suboptimal results, the question of when to ... more Background: When a clinical treatment fails or shows suboptimal results, the question of when to switch to another treatment arises. Treatment switching strategies are often dynamic because the time of switching depends on the evolution of an individual's time-varying covariates. Dynamic strategies can be directly compared in randomized trials. For example, HIV-infected individuals receiving antiretroviral therapy could be randomized to switching therapy within 90 days of HIV-1 RNA crossing above a threshold of either 400 copies/ml (tight-control strategy) or 1000 copies/ml (loose-control strategy). Methods: We review an approach to emulate a randomized trial of dynamic switching strategies using observational data from the Antiretroviral Therapy Cohort Collaboration, the Centers for AIDS Research Network of Integrated Clinical Systems and the HIV-CAUSAL Collaboration. We estimated the comparative effect of tight-control vs. loose-control strategies on death and AIDS or death via inverse-probability weighting. Results: Of 43 803 individuals who initiated an eligible antiretroviral therapy regimen in 2002 or later, 2001 met the baseline inclusion criteria for the mortality analysis and 1641 for the AIDS or death analysis. There were 21 deaths and 33 AIDS or death events in the tight-control group, and 28 deaths and 41 AIDS or death events in the loose-control group. Compared with tight control, the adjusted hazard ratios (95% confidence interval) for loose control were 1.10 (0.73, 1.66) for death, and 1.04 (0.86, 1.27) for AIDS or death. Conclusions: Although our effective sample sizes were small and our estimates imprecise, the described methodological approach can serve as an example for future analyses.
Background: At-risk levels of alcohol use threaten the health of patients with HIV (PWH), yet evi... more Background: At-risk levels of alcohol use threaten the health of patients with HIV (PWH), yet evidence-based strategies to decrease alcohol use and improve HIV-related outcomes in this population are lacking. We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcohol use and HIV outcomes among PWH and at-risk alcohol use. : In this multi-site, randomized trial conducted between January 28, 2013 through July 14, 2017, we enrolled PWH and at-risk alcohol use [defined as alcohol consumption of ≥ 14 drinks per week or ≥ 4 drinks per occasion in men ≤ 65 years old or ≥ 7 drinks per week or ≥ 3 drinks per occasion in women or men > 65 years old]. ISAT (n = 46) involved: Step 1-Brief Negotiated Interview with telephone booster, Step 2-Motivational Enhancement Therapy, and Step 3-Addiction Physician Management. Treatment as usual (TAU) (n = 47) involved receipt of a health handout plus routine care. Analyses were conducted based on intention to treat principles. Results: Despite a multi-pronged approach, we only recruited 37% of the target population (n = 93/254). Among ISAT participants, 50% advanced to Step 2, among whom 57% advanced to Step 3. Participants randomized to ISAT and TAU had no observed difference in drinks per week over the past 30 days at week 24 (primary outcome) [least square means (Ls mean) (95% CI) = 8.8 vs. 10.6; adjusted mean difference (AMD) (95% CI) = -0.4 (-3.9, 3.0)]. An insufficient number of patients were interested in participating in the trial. Efforts to enhance motivation of PWH with at-risk alcohol use to engage in alcohol-related research and build upon ISAT are needed.
Background We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcoho... more Background We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcohol use and HIV outcomes among patients living with HIV and alcohol use disorder. Methods In this multisite, randomised controlled trial, conducted in five Veterans Affairs-based HIV clinics in the USA (Atlanta, GA; Brooklyn-Manhattan, NY; Dallas and Houston, TX; and Washington, DC), we recruited people living with HIV and an alcohol use disorder who were not otherwise receiving formal alcohol treatment. Patients were eligible if they were aged 18 years or older, HIV positive, English speaking, and met criteria for alcohol use disorder by the Diagnostic and Statistical Manual for Mental Disorders-IV criteria for alcohol abuse or dependence. Key exclusion criteria included if the patient was acutely suicidal or had a psychiatric condition that affected their ability to participate in counselling interventions, or if they had any medical conditions that would preclude completing the study or cause harm during the course of the study. Using a web-based clinical trial management system, we randomly assigned participants (1:1) to receive ISAT or treatment as usual; patients, investigators, and clinicians were unmasked to allocation. ISAT involved three steps: step 1, addiction physician management, comprising eight sessions; step 2, addiction physician management plus motivational enhancement therapy, comprising four sessions; and step 3, specialty referral. Participants were stepped up at weeks 4 and 12 if they exceeded a priori drinking criteria. Treatment as usual involved referral to substance use treatment services. The primary outcome was number of drinks per week over the past 30 days at week 24 by use of the timeline followback method, assessed in the intention-to-treat population. Adverse events were tracked throughout the study period in all randomly assigned participants. This trial is registered at ClinicalTrials.gov, number NCT01410123.
Background We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcoho... more Background We examined the effectiveness of integrated stepped alcohol treatment (ISAT) on alcohol use and HIV outcomes among patients living with HIV and alcohol use disorder. Methods In this multisite, randomised controlled trial, conducted in five Veterans Affairs-based HIV clinics in the USA (Atlanta, GA; Brooklyn-Manhattan, NY; Dallas and Houston, TX; and Washington, DC), we recruited people living with HIV and an alcohol use disorder who were not otherwise receiving formal alcohol treatment. Patients were eligible if they were aged 18 years or older, HIV positive, English speaking, and met criteria for alcohol use disorder by the Diagnostic and Statistical Manual for Mental Disorders-IV criteria for alcohol abuse or dependence. Key exclusion criteria included if the patient was acutely suicidal or had a psychiatric condition that affected their ability to participate in counselling interventions, or if they had any medical conditions that would preclude completing the study or cause harm during the course of the study. Using a web-based clinical trial management system, we randomly assigned participants (1:1) to receive ISAT or treatment as usual; patients, investigators, and clinicians were unmasked to allocation. ISAT involved three steps: step 1, addiction physician management, comprising eight sessions; step 2, addiction physician management plus motivational enhancement therapy, comprising four sessions; and step 3, specialty referral. Participants were stepped up at weeks 4 and 12 if they exceeded a priori drinking criteria. Treatment as usual involved referral to substance use treatment services. The primary outcome was number of drinks per week over the past 30 days at week 24 by use of the timeline followback method, assessed in the intention-to-treat population. Adverse events were tracked throughout the study period in all randomly assigned participants. This trial is registered at ClinicalTrials.gov, number NCT01410123.
Carolina Digital Repository (University of North Carolina at Chapel Hill), 2016
Background. Human immunodeficiency virus (HIV)-infected patients coinfected with hepatitis B (HBV... more Background. Human immunodeficiency virus (HIV)-infected patients coinfected with hepatitis B (HBV) and C (HCV) viruses are at increased risk of end-stage liver disease (ESLD). Whether modern antiretroviral therapy has reduced ESLD risk is unknown. Methods. Twelve clinical cohorts in the United States and Canada participating in the North American AIDS Cohort Collaboration on Research and Design validated ESLD events from 1996 to 2010. ESLD incidence rates and rate ratios according to hepatitis status adjusted for age, sex, race, cohort, time-updated CD4 cell count and HIV RNA were estimated in calendar periods corresponding to major changes in antiretroviral therapy: early (1996)(1997)(1998)(1999)(2000), middle (2001)(2002)(2003)(2004)(2005), and modern (2006-2010) eras. Results. Among 34 119 HIV-infected adults followed for 129 818 person-years, 380 incident ESLD outcomes occurred. ESLD incidence ( per 1000 person-years) was highest in triply infected (11.57) followed by HBV-(8.72) and HCV-(6.10) coinfected vs 1.27 in HIV-monoinfected patients. Adjusted incidence rate ratios (95% confidence intervals) comparing the modern to the early antiretroviral era were 0.95 (.61-1.47) for HCV, 0.95 (.40-2.26) for HBV, and 1.52 (.46-5.02) for triply infected patients. Use of antiretrovirals dually activity against HBV increased over time. However, in the modern era, 35% of HBV-coinfected patients were not receiving tenofovir. There was little use of HCV therapy. Conclusions. Despite increasing use of antiretrovirals, no clear reduction in ESLD risk was observed over 15 years. Treatment with direct-acting antivirals for HCV and wider use of tenofovir-based regimens for HBV should be prioritized for coinfected patients.
e16560Background: Little is known about how the biology of prostate cancer in HIV+ men compares t... more e16560Background: Little is known about how the biology of prostate cancer in HIV+ men compares to that of uninfected men. The purpose of our study was to compare the Gleason grade (GL) of prostate...
In this study, we evaluated fracture incidence over a 10-year period among men with and without o... more In this study, we evaluated fracture incidence over a 10-year period among men with and without osteomyelitis from the Veterans Aging Cohort Study. Fracture incidence was significantly higher among those with osteomyelitis at all osteoporotic fracture sites after adjusting for key related risk factors. Future prospective studies are warranted.
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