1. Division of Radiooncology/Radiobiology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
2. Department of Otolaryngology, Head and Neck Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany
3. Department of Morphological Sciences, Institute of Basic Health Science, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre 90035-003, RS, Brazil
4. Department of Oral Pathology, Faculty of Dental Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre 90035-004, RS, Brazil
5. German Cancer Consortium (DKTK), Core Center Heidelberg, 69120 Heidelberg, Germany
6. Department of Neurosurgery, University Hospital Heidelberg, 69120 Heidelberg, Germany
7. Tissue Bank of the National Center for Tumor Diseases (NCT) Heidelberg, Germany and Institute of Pathology, Heidelberg University Hospital, 69120 Heidelberg, Germany
8. Institute of Pathology, School of Medicine, Technical University of Munich (TUM), 80337 Munich, Germany
9. Heidelberg Institute of Radiation Oncology (HIRO), 69120 Heidelberg, Germany
10. Molecular Mechanisms of Head and Neck Tumors, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
11. Faculty of Dentistry, Institute of Toxicology and Pharmacology, Pontifícial Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre 90619-900, RS, Brazil