1. Department of Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland
2. City of Helsinki, Department of Social Services and Health Care, Oral Health Care, Helsinki, Finland
3. Primary Health Care Unit, Kuopio University Hospital, Kuopio, Finland
4. Folkhälsan Research Center, Folkhälsan, Helsinki, Finland
5. Health Care, Geriatric Clinic, Helsinki Hospital, Helsinki, Finland
6. Department of General Practice, University of Helsinki, Helsinki, Finland
7. Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
8. Oral and Maxillofacial Diseases, Kuopio University Hospital, Kuopio, Finland