1. Vaasa Social Services and Health Care Division, Dental Service, Vaasa, Finland
2. Faculty of Health Sciences, Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
3. Tays Research Services, Tampere University Hospital, Finland
4. Faculty of Social Sciences, Health Sciences, Tampere University, Finland
5. Turku Municipal Health Care Services, Dental Teaching Unit, Turku, Finland
6. Department of Oral Development and Orthodontics, Research Unit of Oral Health Sciences, University of Oulu, Finland
7. Medical Research Center, Oulu University Hospital, Finland
8. Private Practice, Wil, Switzerland
9. Faculty of Medicine and Health Technology, Tampere University, Finland