1. Finnish Doctoral Program in Oral Sciences; Turku Finland
2. Department of Restorative Dentistry and Cariology; Institute of Dentistry; University of Turku; Turku Finland
3. Institute of Dentistry; University of Eastern Finland; Kuopio Finland
4. Department of Oral and Maxillofacial Diseases; University of Helsinki, and Helsinki University Hospital; Helsinki Finland
5. Research Unit of Oral Health Sciences and Medical Research Center Oulu (MRC Oulu); Oulu University Hospital and University of Oulu; Oulu Finland
6. Turku University Hospital, TYKS; University of Turku; Turku Finland