1. Department of Pediatrics, University Hospital Schleswig-Holstein, University of Lübeck, Lübeck, Germany
2. Airway Research Centre North (ARCN), Member of the German Centre for Lung Research (DZL), Grosshansdorf, Germany
3. Institute of Medical Biometry and Statistics, University of Lübeck, Lübeck, Germany
4. Epigenetics of Chronic Lung Disease, Priority Research Area Chronic Lung Diseases, Leibniz Lung Research Center Borstel, Borstel, Germany
5. Institute of Clinical and Molecular Biology, University Hospital Schleswig-Holstein, Christian Albrechts-University, Kiel, Germany
6. Department of Paediatric Respiratory Medicine, Inselspital Bern, University Children’s Hospital of Bern, Bern, Switzerland
7. LungenClinic Grosshansdorf, Grosshansdorf, and Department of Medicine, University Hospital Schleswig Holstein, University of Kiel, Kiel, Germany