1. Department of Medical Affairs MSD Sharp & Dohme GmbH Haar Germany
2. German Cancer Consortium (DKTK), Partner Site Berlin Berlin Germany
3. Department of Radiation Oncology and Radiotherapy Charité University Medicine Berlin Berlin Germany
4. Department of Otorhinolaryngology, Head and Neck Surgery University of Giessen Giessen Germany
5. Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty University of Cologne Cologne Germany