[1] Univ Toronto, Dept Anesthesiol & Pain Med, Toronto, ON M5G 1E2, Canada
[2] Toronto Gen Hosp, Dept Anesthesia & Pain Management, Pain Res Unit, Toronto, ON, Canada
[3] Toronto Gen Hosp, Transit Pain Serv, Toronto, ON, Canada
[4] Univ Calgary, Dept Anesthesiol Perioperat & Pain Med, Calgary, AB, Canada
[5] Cedars Sinai Med Ctr, Dept Med, Los Angeles, CA USA
[6] Hosp Sick Children, Child Hlth Evaluat Sci, Toronto, ON, Canada
[7] Pain BC Pain Canada, Vancouver, BC, Canada
[8] Vancouver Gen Hosp, Vancouver, BC, Canada
[9] Toronto Acad Pain Med Inst, Toronto, ON, Canada