1. Department of Prosthodontics, Heidelberg University Hospital, 69120 Heidelberg, Germany
2. Department of Radiation Oncology, Heidelberg University Hospital, 69120 Heidelberg, Germany
3. Heidelberg Institute of Radiation Oncology (HIRO), 69120 Heidelberg, Germany
4. National Center for Tumor Diseases (NCT), 69120 Heidelberg, Germany
5. Department of Oral and Maxillofacial Surgery, Heidelberg University Hospital, 69120 Heidelberg, Germany
6. Department of Otorhinolaryngology, University of Heidelberg, 69120 Heidelberg, Germany
7. Department of Radiation Oncology, Marburg Ion-Beam Therapy Center (MIT), Marburg University Hospital, 35043 Marburg, Germany
8. Department of Radiation Oncology, Marburg University Hospital, 35043 Marburg, Germany
9. Clinical Cooperation Unit Radiation Oncology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
10. Heidelberg Ion-Beam Therapy Center (HIT), 69120 Heidelberg, Germany
11. German Cancer Consortium (DKTK), Partner Site Heidelberg, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
12. Department of Prosthetic Dentistry, Medical University Innsbruck, 6020 Innsbruck, Austria