1 University College London (UCL) Respiratory, UCL, London, UK; Department of Respiratory Care, Prince Sultan Military College of Health Sciences, Dammam, Saudi Arabia.
2 University College London (UCL) Respiratory, UCL, London, UK.
3 Nuffield Department of Medicine, University of Oxford, Oxford, UK.
4 National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre (BRC) respiratory theme, Translational Medical Sciences, School of Medicine, University of Nottingham, Nottingham, UK.
5 Patient Representative, Shepton Mallet, UK.
6 Park Medical Partnership, Shepton Mallet, UK; Frimley Health NHS Foundation Trust, Windsor, UK.
7 Frimley Health NHS Foundation Trust, Windsor, UK.
8 National Heart and Lung Institute, Imperial College London, London, UK.
9 Central and North West London NHS Foundation Trust, London, UK.
10 Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK.
11 James Lind Alliance, National Institute for Health Research Evaluation, Trials and Studies Coordinating Centre, Southampton, UK.
12 NIHR Southampton BRC, Southampton, UK.
13 University College London (UCL) Respiratory, UCL, London, UK. Electronic address: j.hurst@ucl.ac.uk.