1. Department of Dermatology University Hospital Zurich Zurich Switzerland
2. Faculty of Medicine University of Zurich Zurich Switzerland
3. Department of Dermatology University Hospital Basel Basel Switzerland
4. Oxford School of Surgery Oxford Business Park Oxford UK
5. Swiss4ward, Statistician and Data Analyst Zurich Switzerland
6. Institute for Health Services Research in Dermatology and Nursing (IVDP) University Medical Center Hamburg‐Eppendorf (UKE) Hamburg Germany
7. Department of Dermatology, Inselspital, Bern University Hospital University of Bern Bern Switzerland
8. Department of Rheumatology, University Hospital Zurich University of Zurich Zurich Switzerland
9. Department of Dermato‐Venereology and Wound Healing Centre Copenhagen University Hospital Bispebjerg Copenhagen Denmark
10. Department of Clinical Medicine Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
11. Division of Dermatology and Venereology Geneva University Hospitals Geneva Switzerland
12. Department of Dermatology CHUV University Hospital and University of Lausanne (UNIL) Lausanne Switzerland
13. Clinic of Dermatology, Venereology and Allergology Cantonal Hospital St. Gallen St. Gallen Switzerland
14. Department of Dermatology, Venerology and Allergology University Hospital Frankfurt am Main Frankfurt am Main Germany