1. Department of Dermatology and Venereology, University Hospital Hamburg-Eppendorf , Hamburg, Germany
2. Neurology Clinic and National Center for Tumor Diseases, University Hospital Heidelberg, Heidelberg, Germany
3. Clinical Cooperation Unit Neurooncology, German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany
4. Department of Dermatology and Venereology, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
5. Institute of Pathology, University Medical Center Mannheim, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
6. Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University, Lund, Sweden
7. Lund Stem Cell Center, Department of Laboratory Medicine, Lund University, Lund, Sweden
8. Department of Surgery, RoMed Kliniken Klinkum Rosenheim, Rosenheim, Germany
9. Department of Neurosurgery, Municipal Hospital Memmingen, Memmingen, Germany
10. Skin Cancer Unit, German Cancer Research Center (DKFZ), Heidelberg, Germany
11. Department of Tumor Biology, University Medical Centre Hamburg-Eppendorf , Hamburg, Germany