1. Department of Dermatology, Ruhr-University Bochum , Bochum , Germany
2. Department of Dermatology, Christian Hospital Unna , Unna , Germany
3. Department of Dermatology, Dortmund Hospital gGmbH and Faculty of Health, University of Witten-Herdecke , Dortmund , Germany
4. Translational Skin Cancer Research, DKTK Partner Site Essen/Düsseldorf, West German Cancer Center, Dermatology, University Duisburg-Essen , Essen , Germany
5. German Cancer Research Center (DKFZ) , Heidelberg , Germany