1 Department of Respiratory Medicine, North Tyneside General Hospital, Northumbria Healthcare NHS Foundation Trust, North Shields, UK sean.parker@northumbria-healthcare.nhs.uk.
2 Division of Infection, Immunity and Respiratory Medicine, University of Manchester, Manchester, UK.
3 Department of Respiratory Medicine, Kings College Hospital, London, UK.
4 Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, Faculty of Life Sciences and Medicine, King's College London, London, UK.
5 Manchester Metropolitan University, Manchester, UK.
6 Warminster Primary Care Centre, Warminster, Wiltshire, UK.
7 North West Lung Centre, Manchester University NHS Foundation Trust, Wythenshawe Hospital, Manchester, UK.
8 Manchester University NHS Foundation Trust, Manchester, UK.
9 Medicine, The Queens University of Belfast, Belfast, UK.
10 Nottingham Respiratory Research Unit, University of Nottingham, Nottingham, UK.
11 Castle Hill Hospital, Cottingham, UK.
12 University of Hull, Hull, UK.
13 Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK.
14 Population Health Sciences Institute, Newcastle University, Newcastle, UK.
15 Academic Unit of Primary Care and Population Science, University of Southampton, Southampton, UK.