1. Department of Dermatology and Allergy, University Hospital Bonn, Venusberg-Campus 1, Germany
2. Christine Kühne-Center for Allergy Research and Education Davos (CK-CARE), Davos, Switzerland
3. Department of Medical Biometry, Informatics and Epidemiology, University Hospital Bonn, Venusberg-Campus 1, Germany
4. Allergy Unit, Department of Dermatology, University Hospital of Zürich, Zürich, Switzerland
5. Department of Environmental Medicine, Faculty of Medicine, University of Augsburg, Augsburg, Germany
6. Institute of Environmental Medicine, Helmholtz Zentrum Muenchen, Augsburg, Germany
7. Swiss Institute of Allergy and Asthma Research (SIAF), Davos, Switzerland
8. Children’s Hospital of Eastern Switzerland, St Gallen, Switzerland
9. Faculty of Medicine, University of Zurich, Zürich, Switzerland
10. Translational Immunology in Environmental Medicine, School of Medicine, Technical University of Munich, Munich, Germany
11. Hochgebirgsklinik Davos, Davos, Switzerland