1. Institute of Social and Preventive Medicine University of Bern Bern Switzerland
2. Graduate School for Health Sciences University of Bern Bern Switzerland
3. Pediatric Pulmonology and Cystic Fibrosis Unit, Service of Pediatrics, Department Woman‐Mother‐Child, Lausanne University Hospital University of Lausanne Lausanne Switzerland
4. Kinderpneumologie Horgen Private Practice for Pediatric Pneumology Horgen Switzerland
5. Department of Paediatric Pulmonology University Children's Hospital Basel Basel Switzerland
6. Division of Paediatric Respiratory Medicine and Allergology, Department of Paediatrics, Inselspital, Bern University Hospital University of Bern Bern Switzerland
7. Department of Respiratory Medicine, University Children's Hospital Zurich and Children's Research Centre University of Zurich Zurich Switzerland
8. Division of Paediatric Pulmonology Children's Hospital, Cantonal Hospital Lucerne Lucerne Switzerland