[1] Univ Western Ontario, London Hlth Sci Ctr & St Josephs Hlth Care, Dept Anesthesiol & Perioperat Med, London, ON, Canada
[2] Univ Toronto, Dept Anesthesiol & Pain Med, Toronto, ON, Canada
[3] Univ Hlth Network, Toronto Western Hosp, Dept Anesthesia & Pain Management, Toronto, ON, Canada
[4] Toronto Gen Hosp, Wilson Ctr, Toronto, ON, Canada
[5] Womens Coll Hosp, Womens Coll Res Inst, Toronto, ON, Canada
[6] Univ British Columbia, Fac Med, Vancouver, BC, Canada
[7] Western Univ, Schulich Sch Med & Dent, London, ON, Canada
[8] St Pauls Hosp, Providence Hlth Care, Dept Anesthesia, Vancouver, BC, Canada
[9] Univ British Columbia, Dept Anesthesiol Pharmacol & Therapeut, Vancouver, BC, Canada
[10] St Pauls Hosp, Ctr Hlth Evaluat & Outcomes Sci, Vancouver, BC, Canada