[1] Univ Toronto, Sci Program Med Sci, Toronto, ON, Canada
[2] Univ Toronto, Dept Anesthesiol & Pain Med, Toronto, ON, Canada
[3] Toronto Gen Hosp, Dept Anesthesia & Pain Management, Sinai Hlth, Toronto, ON, Canada
[4] Womens Coll Hosp, Dept Anesthesia & Pain Management, Toronto, ON, Canada
[5] Toronto Gen Hosp Res Inst, Toronto, ON, Canada
[6] Univ Hlth Network, Patient Blood Management Program, Toronto, ON, Canada
[7] Univ Hlth Network, Toronto Gen Hosp, Dept Anesthesia & Pain Management, Eaton North 4-421,200 Elizabeth St, Toronto, ON M5G 2C4, Canada