1. Department of Otorhinolaryngology and Head & Neck Surgery; Leiden University Medical Center; Leiden The Netherlands
2. Department of Otorhinolaryngology and Head & Neck Surgery; University Medical Center Utrecht; Utrecht The Netherlands
3. Department of Radiotherapy; University Medical Center Utrecht; Utrecht The Netherlands
4. Department of Radiology; University Medical Center Utrecht; Utrecht The Netherlands
5. Rudolf Magnus Institute of Neuroscience; University Medical Center Utrecht; Utrecht The Netherlands
6. Department of Head and Neck Surgical Oncology; University Medical Center Utrecht; Utrecht The Netherlands