1. Department of Pathology; Haartman Institute; University of Helsinki; Helsinki Finland
2. Institute of Dentistry; University of Misurata; Misurata Libya
3. Department of Diagnostics and Oral Medicine; Oulu University Hospital, and Medical Research Center; Oulu Finland
4. Institute of Dentistry; University of Helsinki; Helsinki Finland
5. Department of Oral Pathology; Institute of Dentistry; University of Helsinki; Helsinki Finland
6. Department of Pathology; University of Turku; Turku Finland