1. From the Institute of Dentistry, University of Helsinki, and Department of Oral and Maxillofacial Diseases, Helsinki University Central Hospital (A.M.T., T.T., T.S., P.J.P.), and the Research Institute of Public Health (K.N., J.A.L., T.-P.T.), University of Kuopio, Finland, Oy Jurilab Ltd. (J.T.S.).