1. Department of Dermatology, University Hospital of Essen, Essen, Germany
2. National Center for Tumor Diseases (NCT), Department of Translational Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany
3. University Hospital Heidelberg, Department of Dermatology, Heidelberg, Germany
4. German Cancer Consortium (DKTK), University of Heidelberg, Heidelberg, Germany