1. Pediatric Pulmonology Unit and Cystic Fibrosis Center, Hadassah Medical Center and Faculty of Medicine Hebrew University of Jerusalem Jerusalem Israel
2. Pediatric Pulmonology Unit and Cystic Fibrosis Center Hospital Universitari Vall d' Hebron Barcelona Spain
3. Department of Physiotherapy and Cystic Fibrosis Center Hadassah‐Hebrew University Medical Center Jerusalem Israel
4. Department of Radiology, Hadassah Medical Center and Faculty of Medicine Hebrew University of Jerusalem Jerusalem Israel