[1] Dalhousie Univ, Div Gastroenterol & Nutr, Dept Paediat, IBD Ctr, Halifax, NS B3K 6R8, Canada
[2] Univ Edinburgh, Dept Child Life & Hlth, Edinburgh, Midlothian, Scotland
[3] Univ Toronto, Dept Immunol, Toronto, ON, Canada
[4] Yorkhill Hosp, Dept Paediat Gastroenterol, Glasgow, Lanark, Scotland
[5] Univ Edinburgh, Gastrointestinal Unit, Edinburgh, Midlothian, Scotland
[6] Hosp Sick Children, Div Paediat Gastroenterol, Toronto, ON M5G 1X8, Canada