1. Pediatric Pulmonology and Sleep Medicine, Cystic Fibrosis Center, Children's Hospital University of Duisburg‐Essen Essen Germany
2. Gruber Sports Science, Sports Consultation, Sports Pedagogy Stahnsdorf Germany
3. Department of Pediatric Pulmonology University Children's Hospital, Ruhr University Bochum Germany
4. Clinic for Children and Youth Medicine Marien‐Hospital Wesel Germany
5. Department of Pulmonary Medicine University Hospital Essen—Ruhrlandklinik, Adult Cystic Fibrosis Center, University of Duisburg‐Essen Essen Germany