[1] Univ Cambridge, MRC Canc Unit, Cambridge CB2 0XZ, England
[2] Nottingham Univ Hosp NHS Trust, Queens Med Ctr, Nottingham Digest Dis Ctr, NIHR Biomed Res Unit, Nottingham, England
[3] Univ Manchester, GI Sci Ctr, Salford Royal NHS Fdn Trust, Salford, Lancs, England
[4] Univ London St Georges Hosp, Dept Gastroenterol, London, England
[5] Royal Victoria Hosp, Dept Gastroenterol, Belfast BT12 6BA, Antrim, North Ireland
[6] Sandwell & West Birmingham Hosp, Dept Gastroenterol, Birmingham, W Midlands, England
[7] Southampton Univ Hosp, Dept Gastroenterol, Southampton, Hants, England
[8] Univ Hosp NHS Trust, Dept Histopathol, Nottingham, England
[9] South Warwickshire NHS Fdn Trust, Dept Histopathol, Warwick, England
[10] Cambridge Univ Hosp, Dept Histopathol, Cambridge, England
[11] Oxford Univ Hosp, Dept Gastroenterol, Oxford, England
[12] Portsmouth Hosp NHS Trust, Dept Gastroenterol, Queen Alexandra Hosp, Portsmouth, Hants, England
[13] Plymouth Univ Peninsula, Sch Med & Dent, Plymouth, Devon, England
[14] Northumbria Healthcare NHS Fdn Trust, North Tyneside Hosp, Dept Surg, North Shields, England
[15] Univ Nottingham Hosp, Dept Surg, Nottingham NG7 2UH, England
[16] Univ Hosp, Dept Gastroenterol, Coventry, W Midlands, England
[17] Kings Coll London, Dept Res Oncol, London, England
[18] McMaster Univ, Hamilton, ON L8S 4L8, Canada
[19] Univ Cambridge, Dept Publ Hlth & Primary Care, Cambridge, England
[20] Leicester Univ Hosp, Ctr Digest Dis, Leicester, Leics, England