1. Department of Dermatology and Venereology University Medical Center Hamburg‐Eppendorf Hamburg Germany
2. Department of Dermatology Ludwigshafen City Hospital Ludwigshafen Germany
3. Center for Dermatology Allergology and Dermatosurgery Helios University Hospital Wuppertal University of Witten/Herdecke Wuppertal Germany
4. Department of Dermatology Elbe Hospital Academic Teaching Hospital of the University Medical Center Hamburg‐Eppendorf Buxtehude Germany