1. Department of ENT/Head and Neck Surgery, Haukeland University Hospital, Bergen, Norway;
2. Department of ENT/Head and Neck surgery, Haukeland Universitetssjukehus, Bergen, Norway;
3. Department of Oncology, Haukeland University Hospital, Bergen, Norway;
4. Department of Clinical Medicine, University of Bergen, Bergen, Norway;
5. Department of Pathology, Haukeland University Hospital, Bergen, Norway;
6. Department of Clinical Medicine, University of Bergen, Haukeland University Hospital, Bergen, Norway;
7. Deptartment of ENT/Head and Neck Surgery, Haukeland University Hospital, Bergen, Norway