1. Department of Otorhinolaryngology, Head and Neck Surgery; Ludwig-Maximilians-University; Munich Germany
2. Clinical Cooperation Group Personalized Radiotherapy in Head and Neck Cancer; Helmholtz Center; Munich Germany
3. Department of Otorhinolaryngology, Head and Neck Surgery; Evangelical Hospital of Dusseldorf; Dusseldorf Germany
4. Department of Otorhinolaryngology, Head and Neck Surgery; Georg-August-University; Göttingen Germany