1. Department of Prosthetic Dentistry and Stomatognathic Physiology University of Turku Turku Finland
2. City of Turku Welfare Division Turku Finland
3. Department of Community Dentistry University of Turku Turku Finland
4. Institute of Dentistry University of Eastern Finland Kuopio 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
7. Centre for Population Health University of Turku and Turku University Hospital Turku Finland