1. Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
2. Research Unit of Oral Health Sciences, Faculty of Medicine, University of Oulu, Oulu, Finland
3. Oral and Maxillofacial Department, Medical Research Center Oulu, Oulu University Hospital, Oulu, Finland
4. Department of Public Health Solutions, Mental Health Unit, Finnish Institute for Health and Welfare, Helsinki, Finland
5. Department of Oral and Maxillofacial Diseases, Kuopio University Hospital, Kuopio, Finland
6. Public Health Evaluation and Projection Unit, Finnish Institute for Health and Welfare (THL), Helsinki, Finland