[1] Univ Helsinki, Finnish Twin Cohort Study, Dept Publ Hlth, FIN-00014 Helsinki, Finland
[2] Univ Helsinki, Cent Hosp Helsinki, Dept Med, Div Diabet, FIN-00014 Helsinki, Finland
[3] Univ Roma La Sapienza, Dept Internal Med & Med Specialties, Rome, Italy
[4] Dept Psychiat Helsinki, Obes Res Unit, Helsinki, Finland
[5] Natl Inst Hlth & Welfare Helsimki, Dept Mental Hlth & Subst Abuse Serv, Helsimki, Finland
[6] Inst Mol Med Helsinki, Helsinki, Finland
[7] Univ Helsinki, Cent Hosp Helsinki, Dept Med, Div Cardiol, FIN-00014 Helsinki, Finland