[1] Dalhousie Univ, St John Reg Hosp, Dept Emergency Med, St John, NB E2L 4L4, Canada
[2] Mem Univ Newfoundland, Discipline Emergency Med, St John Reg Hosp, St John, NB, Canada
[3] Dalhousie Univ, St John Reg Hosp, Dept Anesthesia Pain Management & Perioperat Med, St John, NB E2L 4L4, Canada
[4] Mem Univ Newfoundland, St John Reg Hosp, Discipline Anesthesia, St John, NB, Canada