[1] Kelowna Gen Hosp, Dept Emergency Med, 2268 Pandosy Ave, Kelowna, BC V1Y 1T2, Canada
[2] Univ British Columbia, Fac Med, Dept Emergency Med, Vancouver, BC, Canada
[3] Univ British Columbia, Div Neurol, Fac Med, Vancouver, BC, Canada
[4] Univ British Columbia, Dept Family Practice, Vancouver, BC, Canada
[5] St Pauls Hosp, Dept Emergency Med, Vancouver, BC, Canada