[1] Hosp Sick Children, Dept Gastroenterol Hepatol & Nutr, 555 Univ Ave, Toronto, ON M5G 1X8, Canada
[2] SickKids Res Inst, Child Hlth Evaluat Sci, 686 Bay St, Toronto, ON M5G 0A4, Canada
[3] Univ Toronto, Dept Psychiat, 27 Kings Coll Cir, Toronto, ON M5S 3K1, Canada
[4] Univ Ottawa, Fac Hlth Sci, Sch Nursing, 451 Smyth Rd, Ottawa, ON K1H 8M5, Canada
[5] Univ Guelph, Dept Psychol, 50 Stone Rd East, Guelph, ON N1G 2W1, Canada
[6] McMaster Childrens Hosp, Pediat Chron Pain Program, 1200 Main St West, Hamilton, ON L8N 3Z5, Canada
[7] Univ Toronto, Lawrence S Bloomberg Fac Nursing, 155 Coll St,Suite 130, Toronto, ON M5T 1P8, Canada