1. Department of Paediatric and Adolescent Medicine, CF Centre Copenhagen, Danish Paediatric Pulmonary Service, Copenhagen University Hospital, Copenhagen, Denmark
2. Department of Pediatrics, Queen Silvia Children’s Hospital, West Sweden CF Center, Gothenburg, Sweden
3. The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
4. Department of Respiratory Medicine, The Children’s Hospital at Westmead, Sydney, New South Wales, Australia
5. The Discipline of Paediatrics and Child Health, The University of Sydney, Sydney, New South Wales, Australia
6. Airway Physiology and Imaging Group, The Woolcock Medical Research Institute, Sydney, New South Wales, Australia
7. Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
8. Department of Pediatrics, General Hospital, Skövde, Sweden