1. Institute of Dentistry University of Eastern Finland Kuopio Finland
2. Department of Oral and Maxillofacial Diseases Kuopio University Hospital Kuopio Finland
3. Public Health Evaluation and Projection Unit National Institute for Health and Welfare Helsinki Finland
4. Institute of Dentistry University of Turku Turku Finland
5. Center for Life Course Health Research, Institute of Medicine University of Oulu Oulu Finland