1 Centre for Exercise and Rehabilitation Science and The Institute for Lung Health, Leicester Respiratory Biomedical Research Unit, Glenfield Hospital, University Hospitals of Leicester NHS Trust, Groby Road, Leicester, LE3 9QP, UK; School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK. Electronic address: michael.steiner@uhl-tr.nhs.uk.
2 Institute of Health Sciences Education, Queen Mary University of London, Barts Health NHS Trust, London, UK; UCLPartners, AHSN, London, UK; Clinical Effectiveness Unit, Royal College of Physicians of London, London, UK.