1. Department of Dermatology; University Medical Centre Groningen; University of Groningen; Groningen The Netherlands
2. Department of Otorhinolaryngology; Head and Neck Surgery; University Medical Centre Groningen; University of Groningen; Groningen The Netherlands
3. Department of Oral and Maxillofacial Surgery; University Medical Centre Groningen; University of Groningen; Groningen The Netherlands
4. Department of Pathology; University Medical Centre Groningen; University of Groningen; Groningen The Netherlands
5. Department of Radiation Oncology; University Medical Centre Groningen; University of Groningen; Groningen The Netherlands