[1] Dalhousie Univ, Dept Psychol & Neurosci, Halifax, NS, Canada
[2] IWK Hlth Ctr, Ctr Pediat Pain Res, Halifax, NS, Canada
[3] Dalhousie Univ, Dept Pediat, Halifax, NS, Canada
[4] Univ Guelph, Dept Psychol, Guelph, ON, Canada
[5] McMaster Childrens Hosp, Pediat Chron Pain Program, Hamilton, ON, Canada
[6] McGill Univ, Dept Family Med, Montreal, PQ, Canada
[7] Univ Toronto, Leslie Dan Fac Pharm, Toronto, ON, Canada
[8] Hosp Sick Children, Child Hlth Evaluat Sci Res Inst, Toronto, ON, Canada
[9] Univ Toronto, Fac Med, Dept Psychiat, Toronto, ON, Canada
[10] Univ Toronto, Dalla Lana Sch Publ Hlth, Toronto, ON, Canada
[11] Univ Calgary, Dept Anesthesiol Perioperat & Pain Med, Calgary, AB, Canada
[12] BC Childrens Hosp, Vancouver, BC, Canada
[13] Univ British Columbia, Dept Psychiat, Vancouver, BC, Canada