1. Department of Oral Public Health, Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
2. Department of Oral and Maxillofacial Diseases, Faculty of Medicine, University of Helsinki, Helsinki, Finland
3. King’s College London Dental Institute at Guy’s, King’s College, and St. Thomas’s Hospitals, Division of Population and Patient Health, London, UK
4. Medical Research Center, Oulu University Hospital and University of Oulu, Oulu, Finland
5. The Living Environment and Health Unit, National Institute for Health and Welfare (THL), Kuopio, Finland
6. The Health Monitoring Unit, National Institute for Health and Welfare (THL), Helsinki, Finland
7. Department of Oral and Maxillofacial Surgery, Kuopio University Hospital, Kuopio, Finland