1. Department of Maxillofacial Surgery Haukeland University Hospital Bergen Norway
2. Department of Clinical Odontology University of Bergen Bergen Norway
3. Department of Pathology Haukeland University Hospital Bergen Norway
4. The Gade Laboratory for Pathology, Department of Clinical Medicine University of Bergen Bergen Norway
5. Department of Otolaryngology Haukeland University Hospital Bergen Norway
6. Faculty of Health Sciences UiT The Arctic University of Norway Tromsø Norway