[1] IWK Hlth Ctr, Halifax, NS, Canada
[2] Univ Toronto, Fac Nursing, Toronto, ON, Canada
[3] Univ Alberta, Dept Pediat, Edmonton, AB, Canada
[4] Montreal Childrens Hosp, Montreal, PQ, Canada
[5] Hosp Sick Children, Toronto, ON M5G 1X8, Canada
[6] St Justine Univ Hosp, Montreal, PQ, Canada
[7] Complex Pain Serv, Edmonton, AB, Canada