1. Department of Chemistry, University of Oxford, Oxford, United Kingdom
2. Royal Brompton and Harefield Hospitals, Guys and St Thomas’ Trust, London, United Kingdom
3. National Heart and Lung Institute, Imperial College London, London, United Kingdom
4. European Cystic Fibrosis Society, Lung Clearance Index Core Facility, London, United Kingdom
5. Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom