1. Institute of Pathology; Technical University of Munich; Munich Germany
2. Department of Oral and Maxillofacial Surgery; Klinikum Rechts der Isar; Munich Germany
3. National Centre of Tumour Diseases (NCT); Heidelberg Germany
4. German Cancer Consortium (DKTK); Technical University of Munich; Munich Germany
5. Institute of Medical Statistics and Epidemiology; Technical University of Munich; Munich Germany