1. Complex Breathlessness Service, Chest Clinic, Lancashire Teaching Hospitals NHS Trust, Royal Preston Hospital Preston United Kingdom
2. Division of Health Research, Faculty for Health and MedicineLancaster University Lancaster United Kingdom
3. North West Lung CentreUniversity Hospital of South Manchester Manchester United Kingdom
4. Division of Infection, Immunity, and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science CentreThe University of Manchester and University Hospital of South Manchester, NHS Foundation Trust Manchester United Kingdom