1 Norwich Medical School University of East Anglia, Norwich, England; National Institute for Health Research, Applied Research Collaboration, East of England, Norwich, England. Electronic address: rory.cameron@uea.ac.uk.
2 Patient representative, York, England.
3 Adult Cystic Fibrosis Centre, Royal Brompton Hospital, London, England; National Heart and Lung Institute Imperial College, London, England.
4 Norwich Medical School University of East Anglia, Norwich, England; Evidera Inc, Norwich, England.
5 National Heart and Lung Institute Imperial College, London, England; Department of Paediatric Respiratory Medicine, Royal Brompton Hospital, London, England.