1. Department of Dermatology, Venereology and Allergology St. Josef Hospital Ruhr University Bochum Bochum Germany
2. Department of Gynaecology and Obstetrics St. Vincenz Hospital Vestische Caritas Clinics GmbH Datteln Germany
3. Department of Dermatology University Allergy Centre University of Dresden Dresden Germany
4. Allergy Unit, Dermatology Clinic University Hospital Basel University of Basel Basel Switzerland
5. Department of Allergology Dermatologikum Hamburg Hamburg Germany
6. Department of Dermatology and Allergology University Medical Center Göttingen Göttingen Germany
7. Department of Dermatology and Allergology Kantonsspital Aarau Aarau Switzerland
8. Department of Dermatology University Hospital of Erlangen Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
9. Department of Dermatology Saarland University Medical Center Homburg/Saar Germany
10. Department of Dermatology and Allergology Ludwig Maximilians University of Munich Munich Germany
11. Centre for Dermatology, Phlebology and Allergology Hospital Stuttgart Stuttgart Germany
12. Institute for Interdisciplinary Dermatological Prevention and Rehabilitation (iDerm) BG Hospital Hamburg Hamburg Germany
13. Department of Dermatology, Inselspital Bern University Hospital University of Bern Bern Switzerland
14. Department of Dermatology, Venerology and Allergology University of Leipzig Leipzig Germany
15. Occupational Dermatology Department of Dermatology Ruprecht Karls University of Heidelberg Heidelberg Germany
16. Division of Allergy and Immunology Department of Dermatology, Allergy and Venerology Charité Universitätsmedizin Berlin Berlin Germany
17. Department of Medicine I St. Josef Hospital Ruhr University Bochum Bochum Germany
18. Information Network of Departments of Dermatology (IVDK) University Medical Center Göttingen Göttingen Germany