1. Department of Pediatric Pneumology, Allergy and Neonatology; Hannover Medical School; Hannover Germany
2. Department of Pediatric Pneumology and Allergy; University Children's Hospital Regensburg (KUNO); Regensburg Germany
3. Institute of Clinical Molecular Biology; Christian-Albrechts-University Kiel; Kiel Germany
4. University Children's Hospital; Technical University Dresden; Dresden Germany
5. Children's Department; Research Institute for the Prevention of Allergic Diseases; Marien-Hospital; Wesel Germany
6. Department of Experimental Pneumology; Ruhr-University; Bochum Germany
7. University Children's Hospital; Albert Ludwigs University; Freiburg Germany
8. Kinder- und Jugendarztpraxis Laub; Rosenheim Germany
9. University Children's Hospital; University of Cologne; Cologne Germany
10. Children's Department; University Teaching Hospital; Landeskrankenhaus Feldkirch; Feldkirch Austria
11. University Children's Hospital Vienna; Vienna Austria
12. Institute of Epidemiology and Medical Biometry; Ulm University; Ulm Germany
13. John Paul II Hospital; Krakow Poland
14. Institute of Laboratory Medicine; Philipps-Universität Marburg; Marburg Germany
15. Member of the German Lung Research Center (DLZ)