1. Institute of Pathology, Technical University of Munich, Munich, Germany
2. National Center of Tumor Diseases (NCT), Heidelberg, Germany
3. German Cancer Consortium (DKTK), Heidelberg, Germany
4. Institute of Pathology, University of Bern, Bern, Switzerland
5. Institute of Medical Statistics and Epidemiology, Technical University of Munich, Munich, Germany
6. Department of Oral and Maxillofacial Surgery, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany