1. Department of Radiation Oncology; University Hospital of Erlangen; Erlangen Germany
2. Department of Otorhinolaryngology; University Hospital of Erlangen; Erlangen Germany
3. Department of Medical Informatics, Biometry and Epidemiology; Friedrich Alexander University of Erlangen-Nuremberg; Erlangen Germany
4. Department of Oral and Maxillofacial Surgery; University Hospital of Erlangen; Erlangen Germany
5. Institute of Pathology; University Hospital of Erlangen; Erlangen Germany