1. Department of Otorhinolaryngology, Head and Neck Surgery and Oncology; University Medical Center Hamburg-Eppendorf; Hamburg Germany
2. Hermann-Holthusen Institute for Radiotherapy; Asklepios St. Georg Hospital; Hamburg Germany
3. Department of Medical Oncology; University Medical Center Hamburg-Eppendorf; Hamburg Germany
4. Department of Otorhinolaryngology and Head & Neck Surgery; Asklepios Altona Hospital; Hamburg Germany