1. From the Institute of Dentistry (P.J.P.), University of Helsinki, and Department of Oral and Maxillofacial Diseases, Helsinki University Central Hospital, Helsinki; the Research Institute of Public Health (K.N., R.S., J.A.L., J.T.S.), University of Kuopio; the Department of Health and Functional Ability (G.A.), National Public Health Institute, Helsinki; Savonlinna Central Hospital (J.A.L.), Savonlinna; and Oy Jurilab Ltd (J.T.S.), Kuopio, Finland.