[1] Lower Mainland Pharm Serv, Vancouver, BC, Canada
[2] Vancouver Gen Hosp, Pharm Dept, 899 W 12th Ave, Vancouver, BC V5Z 1M9, Canada
[3] Univ British Columbia, Fac Pharmaceut Sci, Vancouver, BC, Canada
[4] Univ British Columbia, Dept Emergency Med, Vancouver, BC, Canada
[5] Vancouver Coastal Hlth Res Inst, Ctr Clin Epidemiol & Evaluat, Vancouver, BC, Canada
[6] Vancouver Gen Hosp, Social Work Dept, Vancouver, BC, Canada
[7] Vancouver Gen Hosp, Dept Emergency Med, Vancouver, BC, Canada
[8] Univ British Columbia, Sch Nursing, Vancouver, BC, Canada
[9] St Pauls Hosp, Dept Emergency Med, Vancouver, BC, Canada
[10] BC Childrens Hosp, Dept Emergency Med, Vancouver, BC, Canada
[11] BC Ctr Dis Control, Vancouver, BC, Canada