[1] Univ Hosp Southampton NHS Fdn Trust, Dept Gastroenterol, Southampton SO16 6YD, England
[2] St Marks Natl Bowel Hosp & Acad Inst, Dept Inflammatory Bowel Dis, London, England
[3] Imperial Coll London, Dept Metab Digest & Reprod, London, England
[4] HCS Belfast Hlth & Social Care Trust, Dept Chem Pathol, Belfast, North Ireland
[5] Sheffield Teaching Hosp NHS Fdn Trust, Acad Dept Gastroenterol, Sheffield, England
[6] Univ Sheffield, Acad Unit Gastroenterol, Sheffield, England
[7] Salford Royal NHS Fdn Trust, Intestinal Failure Unit, Salford, England
[8] Doncaster & Bassetlaw Teaching Hosp NHS Fdn Trust, Doncaster, England
[9] Royal Sussex Cty Hosp, Dept Gastroenterol, Brighton, England
[10] Liverpool Univ Hosp NHS Fdn Trust, Liverpool, England
[11] Stockport NHS Fdn Trust, Stockport, England
[12] Barts Hlth NHS Trust, London, England