1. Department of Dermatology and Venereology, Otto von Guericke University of Magdeburg; Magdeburg Germany
2. Department of Dermatology, University Medical Center Essen; Essen Germany
3. Center for Dermatooncology, Department of Dermatology, University of Tübingen; Tübingen Germany
4. Department of Dermatology, Allergology, and Phlebology, Medical Center Bremerhaven; Bremerhaven Germany
5. Skin Tumor Center Hanover, Department of Dermatology, Allergology, and Venereology, Medical University Hanover; Hanover Germany