1. Institute of Pneumology at the University of Cologne Solingen Germany
2. Clinic for Pneumology and Allergology, Center of Sleep Medicine and Respiratory Care, Bethanien Hospital Solingen Solingen Germany
3. Center for Rare Diseases, Faculty of Medicine University of Cologne, Children's Hospital Cologne Germany
4. Faculty of Medicine University of Cologne, Pediatric Pulmonology, Allergology and Cystic Fibrosis Center, Children's Hospital Cologne Germany