[1] CHEO, Div Gastroenterol Hepatol & Nutr, Childrens Hosp Eastern Ontario CHEO, Inflammatory Bowel Dis Ctr, Ottawa, ON, Canada
[2] Univ Ottawa, Sch Epidemiol & Publ Hlth, Ottawa, ON, Canada
[3] Hosp Sick Children, SickKids Inflammatory Bowel Dis Ctr, Div Gastroenterol Hepatol & Nutr, Toronto, ON, Canada
[4] Hosp Sick Children, SickKids Res Inst, Child Hlth Evaluat Sci, Toronto, ON, Canada
[5] CHEO Res Inst, Ottawa, ON, Canada
[6] Univ Ottawa, Dept Pediat, Ottawa, ON, Canada
[7] ICES, Toronto, ON, Canada
[8] Univ Ottawa, Dept Med, Ottawa, ON, Canada
[9] Univ Calgary, Dept Med, Calgary, AB, Canada
[10] Univ Calgary, Dept Community Hlth Sci, Calgary, AB, Canada
[11] Univ Toronto, Hosp Sick Children, Dept Paediat, Toronto, ON, Canada