1. Department of Oral Pathology and Oral Radiology Institute of Dentistry, University of Turku Turku Finland
2. Department of Clinical Medicine Faculty of Medicine, University of Turku Turku Finland
3. Department of Oral Diseases Turku University Hospital Turku Finland
4. Department of Oral and Maxillofacial Diseases Clinicum, Faculty of Medicine, University of Helsinki and Helsinki University Hospital Helsinki Finland