[1] St Michaels Hosp, Suicide Studies Res Unit, Toronto, ON M5B 1W8, Canada
[2] Univ Toronto, Fac Med, Dept Psychiat, Toronto, ON M5S 1A1, Canada
[3] St Michaels Hosp, Li Ka Shing Knowledge Inst, Keenan Res Ctr, Ctr Res Inner City Hlth, Toronto, ON M5B 1W8, Canada
[4] Univ Toronto, Dalla Lana Sch Publ Hlth, Div Biostat, Toronto, ON M5S 1A1, Canada
[5] Univ Toronto, Dept Psychiat, Toronto, ON M5S 1A1, Canada
[6] St Michaels Hosp, Inpatient Mental Hlth Unit, Toronto, ON M5B 1W8, Canada
[7] Univ No British Columbia, Hlth Sci Programs, Prince George, BC V2L 5P2, Canada
[8] Univ Maine, Orono, ME 04469 USA