[1] Univ Oslo, Natl Ctr Suicide Res & Prevent, Inst Clin Med, N-0316 Oslo, Norway
[2] Univ Oslo, Inst Clin Med, N-0316 Oslo, Norway
[3] Oslo Univ Hosp, Div Mental Hlth & Addict, Dept Child & Adolescent Mental Hlth, Oslo South North, Norway
[4] Montefiore Med Ctr, New York, NY USA
[5] Diakonhjemmet Hosp, Dept Psychiat, Oslo, Norway
[6] Columbia Univ, New York State Psychiat Inst, New York, NY USA