1. Department of Pediatrics, RCSI University of Medicine and Health Sciences, Dublin, Ireland;
2. Children’s Health Ireland, Dublin, Ireland;
3. School of Medicine, University of Limerick, Limerick, Ireland;
4. Cystic Fibrosis Registry of Ireland, Dublin, Ireland;
5. Royal Brompton Hospital, London, United Kingdom;
6. Erasmus Medical Centre, Rotterdam, the Netherlands;
7. St. Vincent’s University Hospital, Dublin, Ireland; and
8. National Heart and Lung Institute, Imperial College London, London, United Kingdom