Matthias Loeckx   ^{1, 2, 3} , MSc ;   Roberto A Rabinovich   ⁴ , MD, PhD ;   Heleen Demeyer   ^{1, 2, 5} , PhD ;   Zafeiris Louvaris   ^{1, 6} , PhD ;   Rebecca Tanner   ⁷ , MSc ;   Noah Rubio   ⁴ , BSc ;   Anja Frei   ⁸ , PhD ;   Corina De Jong   ⁹ , PhD ;   Elena Gimeno-Santos   ^{5, 10, 11} , PhD ;   Fernanda M Rodrigues   ^{1, 2} , MSc ;   Sara C Buttery   ⁷ , BSc ;   Nicholas S Hopkinson   ⁷ , MD, PhD ;   Gilbert Büsching   ⁸ ;   Alexandra Strassmann   ⁸ , MSc ;   Ignasi Serra   ^{5, 10, 11} , MSc ;   Ioannis Vogiatzis   ^{6, 12} , PhD ;   Judith Garcia-Aymerich   ^{5, 10, 11} , MD, PhD ;   Michael I Polkey   ⁷ , MD, PhD ;   Thierry Troosters   ^{1, 2} , PhD

¹ Department of Rehabilitation Sciences, KU Leuven, Leuven, Belgium

² Respiratory Division, University Hospitals Leuven, Leuven, Belgium

³ Department of Physiotherapy, LUNEX International University of Health, Exercise and Sports, Differdange, Luxembourg

⁴ ELEGI Colt Laboratory, Centre for Inflammation Research, The Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom

⁵ ISGlobal, Barcelona, Spain

⁶ Faculty of Physical Education and Sports Sciences, National and Kapodistrian University of Athens, Athens, Greece

⁷ National Institute for Health Research Respiratory Biomedical Research Unit, Royal Brompton and Harefield National Health Services Foundation Trust and Imperial College, London, United Kingdom

⁸ Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland

⁹ Groningen Research Institute for Asthma and Chronic Obstructive Pulmonary Disease-Primary Care, Department of General Practice and Elderly Care, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands

¹⁰ Centro de Investigación Biomédica en Red en Epidemiología y Salud Pública, Barcelona, Spain

¹¹ Department of Communication, Universitat Pompeu Fabra, Barcelona, Spain

¹² Department of Sport, Exercise and Rehabilitation, Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom