1. Faculty of Medicine, Department of Oral Pathology, Institute of DentistryUniversity of Turku Turku Finland
2. Biostatistics, Department of Clinical MedicineUniversity of Turku and Turku University Hospital Turku Finland
3. Helsinki University Central Hospital Helsinki Finland
4. Department of Oral Pathology, Institute of DentistryUniversity of Helsinki Helsinki Finland
5. Finland Cancer and Translational Medicine Research UnitUniversity of Oulu Oulu Finland
6. Medical Research Center Oulu Oulu Finland
7. Department of PathologyTurku University Hospital Turku Finland