1. Institute and Clinic for Occupational, Social, and Environmental Medicine; University Hospital, LMU Munich; Munich Germany
2. Comprehensive Pneumology Center Munich; German Center for Lung Research; Munich Germany
3. Paediatric Department; University Hospital Carl Gustav Carus, TU Dresden; Dresden Germany
4. Institute of Epidemiology and Medical Biometry; Ulm University; Ulm Germany
5. Institute for Epidemiology, Biostatistics and Prevention; Zürich University; Zürich Switzerland
6. Institute for Medical Informatics and Biometry; Medical Faculty; “Carl Gustav Carus”, TU; Dresden Germany
7. Dr v Haunersches Kinderspital; University Hospital, LMU Munich; Munich Germany