1. Department of Dermatology, Inselspital Bern University Hospital Bern Switzerland
2. Centro Studi GISED Bergamo Italy
3. Institute of Epidemiology and Preventive Medicine University of Regensburg Regensburg Germany
4. Department of Clinical Social Medicine Occupational and Environmental Dermatology University Hospital Ruprecht Karls University Heidelberg Germany
5. Department of Dermatology and Allergy Ludwig Maximilian University Munich Germany
6. Department of Dermatology University Hospital Carl Gustav Carus Technical University Dresden Dresden Germany
7. Department of Dermatology University Hospital of Erlangen Friedrich Alexander University Erlangen‐Nuremberg Erlangen Germany
8. Department of Dermatology and Dermatological Allergy Friedrich Schiller University Jena Jena Germany
9. Centre for Evidence‐based Healthcare Medical Faculty Carl Gustav Carus Technical University Dresden Dresden Germany
10. Allergy Unit Department of Dermatology University Hospital Zürich Zurich Switzerland
11. Department of Dermatology University Hospital of Lausanne CHUV Lausanne Switzerland
12. Department of Dermatology Papa Giovanni XXIII Hospital Bergamo Italy