1. Department of Pediatrics Dr. von Hauner Children's Hospital Ludwig Maximilian University Munich Germany
2. German Center for Lung research (DZL) Munich Germany
3. Institute of Pathology Faculty of Medicine Ludwig Maximilian University Munich Germany
4. Department of Radiology Ludwig Maximilian University Munich Germany
5. Environmental Medicine UNIKA‐T Technical University of Munich and HelmholtzZentrum Munich Munich/Augsburg Germany
6. HELIOS Children's Hospital Krefeld Germany
7. Children's Hospital St. Georg Klinikum Leipzig Germany
8. Medizinische Klinik und Poliklinik Ludwig Maximilian University Munich Germany
9. Hochgebirgsklinik and Christine Kühne‐Center for Allergy Research and Education (CK‐Care) Davos Switzerland