[1] Pennine Acute Hosp NHS Trust, Dept Gastroenterol, Manchester, Lancs, England
[2] Barnet & Chase Farm Hosp NHS Trust, Dept Gastroenterol, London, England
[3] Univ British Columbia, Div Gastroenterol, Vancouver, BC, Canada
[4] Kings Coll Hosp NHS Fdn Trust, Dept Gastroenterol, London, England
[5] Kingss Coll London, Dept Gastroenterol, London, England
[6] Univ Hosp Birmingham NHS Fdn Trust, Dept Gastroenterol, Birmingham, W Midlands, England
[7] Univ Birmingham, Dept Gastroenterol, Inst Translat Med, Birmingham, W Midlands, England
[8] Mayo Clin, Dept Med, Div Gastroenterol & Hepatol, Ctr Inflammatory Bowel Dis, Jacksonville, FL 32224 USA
[9] Univ Manchester, Manchester Acad Hlth Sci, Manchester, Lancs, England