[1] Natl Publ Hlth Inst, Dept Mental Hlth & Alcohol Res, SF-00300 Helsinki, Finland
[2] Univ Helsinki, Dept Publ Hlth, FIN-00014 Helsinki, Finland
[3] Univ Texas, Dept Psychiat, San Antonio, TX 78285 USA
[4] Univ Texas, Res Imaging Ctr, San Antonio, TX 78285 USA
[5] Univ Calif Los Angeles, Dept Psychol, TDC, Los Angeles, CA 90024 USA