1. Department of Dermatology University Hospital Schleswig‐HolsteinCampus Kiel Kiel Germany
2. Department of Dermatology University Medical Center Goettingen Germany
3. Department of Dermatology, Venereology, Allergology and Phlebology Johannes Wesling Medical Centre University Hospital of Ruhr‐University Bochum Minden Germany
4. Department of Dermatology University Hospital Mannheim Germany
5. Department of Dermatology University Hospital Würzburg Germany
6. Department of Dermatology Ludwigshafen Germany
7. Hautklinik Städtisches Klinikum Karlsruhe Akademisches Lehrkrankenhaus der Universität Freiburg Karlsruhe Germany
8. Department of Dermatology Vivantes Klinikum Neukölln Berlin Germany
9. Department of Dermatology University Hospital Zurich Switzerland
10. Kempf und Pfaltz Histologische Diagnostik Zurich Switzerland
11. Department of Dermatology Helios‐Klinikum Krefeld Germany