[1] Karolinska Inst, Unit Integrat Epidemiol, Inst Environm Med, Stockholm, Sweden
[2] Univ Iceland, Fac Med, Ctr Publ Hlth Sci, Reykjavik, Iceland
[3] Natl Univ Hosp Iceland, Mental Hlth Serv, Landspitali, Reykjavik, Iceland
[4] Karolinska Inst, Unit Clin Epidemiol, Dept Med, Stockholm, Sweden