1. CK-CARE; Christine Kühne Center for Allergy Research and Education; Davos Switzerland
2. Department of Dermatology; Allergy Unit; Zurich University Hospital; Zurich Switzerland
3. Institute for Medical Information Processing, Biometry and Epidemiology (IBE); LMU Munich; Munich Germany
4. Hochgebirgsklinik Davos; Davos Switzerland
5. Chair and Institute of Environmental Medicine; UNIKA-T; Technical University Munich and Helmholtz Zentrum; München Germany
6. Children's University Hospital Zurich; Zurich Switzerland
7. Children's Hospital of Eastern Switzerland; St. Gallen Switzerland