1. Department of Pathology, Helsinki University and Helsinki University Hospital, Helsinki, Finland;
2. Department of Oral and Maxillofacial Diseases, Head and Neck Centre, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
3. Department of Dental Medicine, Karolinska Institute, Huddinge, Sweden;
4. Institute of Dentistry, University of Eastern Finland, Kuopio, Finland;
5. Department of Oral and Maxillofacial Diseases, Kuopio University Hospital, Kuopio, Finland;
6. HUS Medical Imaging Centre, Helsinki University Hospital and University of Helsinki, Helsinki, Finland;
7. Department of Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
8. Department of Oral and Maxillofacial Surgery, Institute of Dentistry, University of Turku, Turku, Finland;
9. Department of Oral and Maxillofacial Diseases, Turku University Hospital, Turku, Finland