1. Department of Oral and Cranio-Maxillofacial Surgery, Heidelberg University Hospital, 69120 Heidelberg, Germany
2. Institute of Pathology, Heidelberg University Hospital, 69120 Heidelberg, Germany
3. Tissue Bank of the National Center for Tumor Diseases (NCT), 69120 Heidelberg, Germany
4. Department of Oral and Maxillofacial Surgery, Saarland University Hospital, 66421 Homburg, Germany
5. Department of Otorhinolaryngology, Head and Neck Surgery, Heidelberg University Hospital, 69120 Heidelberg, Germany
6. Research Group Molecular Mechanisms of Head and Neck Tumors, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany