[1] Univ Hlth Network, Toronto Western Hosp, Dept Anesthesiol & Pain Med, Toronto, ON, Canada
[2] Univ Hlth Network, Toronto Western Hosp, Dept Anesthesia & Pain Management, Toronto, ON, Canada
[3] Western Univ, Dept Anesthesia & Perioperat Med, Toronto, ON, Canada
[4] Univ Hlth Network, Toronto, ON, Canada