[1] Univ Helsinki, Cent Hosp, Dept Neurosurg, Helsinki, Finland
[2] Univ Helsinki, Dept Social Res, Populat Res Unit, Helsinki, Finland
[3] Natl Inst Hlth & Welf, Dept Chron Dis Prevent, Helsinki, Finland
[4] Natl Inst Hlth & Welf, Dept Mental Hlth & Subst Abuse Serv, Helsinki, Finland
[5] Univ Eastern Finland, Inst Publ Hlth & Clin Nutr, Kuopio, Finland
[6] Hosp Dist N Karelia, Joensuu, Finland
[7] Univ Helsinki, Dept Publ Hlth, Helsinki, Finland
[8] Inst Mol Med FIMM, Helsinki, Finland