1. Department of Dermatology and Allergy, University Hospital Munich (LMU), 80337 Munich, Germany
2. Department of Dermatology, Center for Dermatooncology, University Hospital Tübingen, 72076 Tübingen, Germany
3. Department of Dermatology, University Medical Center Mainz, 55131 Mainz, Germany
4. Department of Dermatology, University Hospital Essen, University of Essen, 45147 Essen, Germany
5. Department of Dermatology and Venereology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, 79104 Freiburg, Germany
6. Skin Cancer Unit, German Cancer Research Center (DKFZ) and Department of Dermatology, Venereology and Allergology, University Medical Center Mannheim, Ruprecht-Karl University of Heidelberg, 68167 Mannheim, Germany
7. Department of Dermatology, Skin Cancer Center, National Center for Tumor Diseases, Medical Faculty and University Hospital Carl Gustav Carus, TU Dresden, 01307 Dresden, Germany
8. Department of Dermatology, University of Cologne, 50937 Cologne, Germany
9. Department of Dermatology, University of Münster, 48149 Münster, Germany
10. Department of Dermatology, Saarland University Medical Center, 66421 Homburg/Saar, Germany
11. Department of Dermatology, Venereology, and Allergology, University Hospital Leipzig, 04103 Leipzig, Germany
12. Department of Internal Medical Oncology, Clinic Hornheide, 48157 Münster, Germany
13. Deparment of Dermatology, Klinikum Süd, 86179 Augsburg, Germany