1. Oral Diseases, The Hospital District of South Ostrobothnia, Seinäjoki, Finland
2. Institute of Dentistry, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
3. Tays Research Services, Tampere University Hospital, Tampere, Finland
4. Faculty of Social Sciences, Health Sciences, Tampere University, Tampere, Finland
5. Dental Teaching Unit, Turku Municipal Health Care Services, Turku, Finland
6. Private practice, Wil, Switzerland
7. Department of Oral Development and Orthodontics, Research Unit of Oral Health Sciences, University of Oulu, Finland and Medical Research Center, Oulu University Hospital, Oulu, Finland
8. Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
9. Department of Oral and Maxillofacial Diseases, Kuopio University Hospital, Kuopio, Finland
10. Department of Ear and Oral Diseases, Tampere University Hospital, Tampere, Finland