1. Department of Dermatology, University Hospital Essen, West German Cancer Center, University Duisburg-Essen and the German Cancer Consortium (DKTK), University of Duisburg-Essen, Duisburg/Essen, Germany
2. Department of Dermatology, Venereology and Allergology, University Hospital Leipzig, Germany
3. Skin Cancer Unit, German Cancer Research Center (DKFZ), Heidelberg and Department of Dermatology, Venereology and Allergology, University Medical Center Mannheim, Ruprecht-Karl University of Heidelberg, Mannheim, Germany
4. Department of Dermatology, Elbe Klinikum Buxtehude, Buxtehude, Germany
5. Department of Dermatology, Klinikum Augsburg, Augsburg, Germany
6. Department of Dermatology, Saarland University Medical School, Homburg/Saar, Germany