1. Department of Pathology, School of Biology and Basic Medical Sciences, Suzhou Medical College of Soochow University, Suzhou 215123, P.R. China
2. Department of Otorhinolaryngology, Head and Neck Surgery, Experimental Head and Neck Oncology, Heidelberg University Hospital, D‑69120 Heidelberg, Germany
3. Institute of Pathology, Heidelberg University Hospital, D‑69120 Heidelberg, Germany
4. Department of Radiation Oncology, Heidelberg University Hospital, D‑69120 Heidelberg, Germany
5. Molecular Diagnostics of Oncogenic Infections, German Cancer Research Center (DKFZ), D‑69120 Heidelberg, Germany
6. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Mannheim, Medical Faculty Mannheim of Heidelberg University, D‑68167 Mannheim, Germany