1. Department of Radiotherapy and Oncology, J. W. Goethe University, Frankfurt am Main, Germany
2. Department of Otorhinolaryngology, J. W. Goethe University, Frankfurt am Main, Germany
3. Department of Maxillofacial Surgery, J. W. Goethe University, Frankfurt am Main, Germany
4. German Cancer Research Center (DKFZ), Heidelberg, Germany
5. German Cancer Consortium (DKTK), Partner Site Frankfurt, Frankfurt, Germany