1 National Center for Tumor Diseases, German Cancer Research Center, Heidelberg, Germany.
2 Department of Dermatology, Heidelberg University, Mannheim, Germany; Skin Cancer Unit, German Cancer Research Center, Heidelberg, Germany.
3 Institute of Pathology and Neuropathology, Eberhard-Karls-University Tuebingen and National Center for Pleura and Peritoneum, University of Tuebingen, Germany.
4 Department of Dermatology, University Hospital Essen, Essen, Germany.
5 Department of Dermatology, University Hospital Cologne, Cologne, Germany.
6 Core Facility Unit Light Microscopy, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.
7 Private Laboratory of Dermatohistopathology, Mönchhofstraße 52, 69120, Heidelberg, Germany.
8 National Center for Tumor Diseases, German Cancer Research Center, Heidelberg, Germany. Electronic address: titus.brinker@dkfz.de.