[1] Dalhousie Univ, Dalhousie Med New Brunswick, St John, NB E2K 5E2, Canada
[2] St Johns Hosp, Dept Emergency Med, Horizon Hlth Network, St John, NB E2L 4L2, Canada
[3] Horizon Hlth Network, Res Serv, St John, NB E2L 4L2, Canada
[4] St Johns Hosp, Trauma New Brunswick, St John, NB E2L 4L2, Canada
[5] Univ Toronto, Dept Med, Div Occupat Med, Toronto, ON M5S 1A1, Canada