[1] Univ Oxford, John Radcliffe Hosp, Translat Gastroenterol Unit, Oxford, England
[2] Univ Oxford, Kennedy Inst Rheumatol, Oxford, England
[3] Great Ormond St Hosp Children NHS Fdn Trust, Dept Gastroenterol, London, England
[4] Evelina London Childrens Hosp, Dept Gastroenterol, London, England
[5] Univ Oxford, Dept Paediat, Oxford, England
[6] NIHR Oxford Biomed Res Ctr, Oxford, England