1. Department of Otorhinolaryngology, Head and Neck Surgery, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
2. Department of Radiation Oncology, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
3. Department of Pathology, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
4. Department of Otorhinolaryngology, Head and Neck Surgery, University of Mannheim, Mannheim, Germany