1. Department of Respiratory Sciences, Leicester Biomedical Research Centre-Respiratory, Glenfield Hospital, University of Leicester, Leicester, UK
2. Centre for Exercise and Rehabilitation Science, Leicester Biomedical Research Centre-Respiratory, Glenfield Hospital, Leicester, UK
3. National Institute for Health Research (NIHR) Applied Research Collaboration (East Midlands), College of Medicine, Biological Sciences & Psychology, Leicester General Hospital, Leicester, UK
4. Leeds Unit of Complex Intervention Development (LUICD), School of Medicine, University of Leeds, Leeds, UK
5. Research Centre for Individual Involvement, Department of Public Health, Aarhus University, Aarhus, Denmark
6. Department of Neuroscience, Psychology and Behaviour, University of Leicester, Leicester, UK