Affiliation: | 1. Department of Diagnostics and Oral Medicine, Institute of Dentistry, University of Oulu, Oulu, Finland;2. Department of Oral and Maxillofacial Diseases, Kuopio University Hospital, Kuopio, Finland;3. Educational Dental Clinic, Health Center of Oulu, Oulu, Finland;4. Medical Informatics and Statistics Research Group, Faculty of Medicine, University of Oulu, Oulu, Finland |