1 Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, UK. Electronic address: d.downey@qub.ac.uk.
2 Adult Cystic Fibrosis Centre, Royal Brompton Hospital, part of Guy's and St Thomas' NHS Foundation Trust, London, UK; National Heart and Lung Institute, Imperial College London, London, UK.
3 CF Centre, Pediatric Pulmonology and Allergology, University Children's Hospital Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, 50937, Cologne, Germany; Centre for Rare Diseases, Faculty of Medicine and University Hospital Cologne, University of Cologne, 50937, Cologne, Germany.
4 Mukoviszidose e.V. & Mukoviszidose Institut gGmbH In den Dauen 6, 53117, Bonn, Germany.
5 European Cystic Fibrosis Society Clinical Trials Network, Karup, Denmark.
6 European Cystic Fibrosis Society Clinical Trials Network, Karup, Denmark; Northern Ireland Clinical Research Facility, Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, UK.
7 University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium.