[1] Univ Coll London Hosp NHS Fdn Trust, Div GI Serv, 235 Euston Rd, London NW1 2BU, England
[2] Imperial Coll London, Dept Surg & Canc, London, England
[3] Imperial Coll London, Dept Metab Digest & Reprod, London, England
[4] St Marks Hosp, Dept Gastroenterol, London, England
[5] St Marks Hosp, Dept Colorectal Surg, London, England
[6] Royal Free Hosp, Dept Gastroenterol, London, England
[7] Nottingham Univ Hosp NHS Trust, Dept Surg, Nottingham, England
[8] Univ Hlth Sci, Tepecik Training & Res Hosp, Dept Surg, Izmir, Turkiye
[9] Univ Toronto, Mt Sinai Hosp, Dept Surg, Toronto, ON, Canada
[10] Humanitas Univ, Dept Biomed Sci, Milan, Italy
[11] IRCCS Humanitas Res Hosp, Dept Surg, Milan, Italy
[12] Austin Hlth, Dept Gastroenterol, Melbourne, Vic, Australia
[13] Univ Melbourne, Austin Acad Ctr, Div Med Dent & Hlth Sci, Melbourne, Vic, Australia
[14] Guys & St Thomas NHS Fdn Trust, Dept Gastroenterol, London, England
[15] Kings Coll London, London, England
[16] Addenbrookes Hosp, Dept Gastroenterol, Cambridge, England
[17] Univ Cambridge, Dept Med, Cambridge, England
[18] Cty Durham & Darlington NHS Fdn Trust, Darlington Mem Hosp, Dept Gastroenterol, Darlington, England
[19] Teesside Univ, Dept Gastroenterol, Middlesbrough, England
[20] NHS Lothian, Western Gen Hosp, Edinburgh IBD Unit, Edinburgh, Scotland
[21] Kings Coll Hosp London, Dept Gastroenterol, London, England
[22] St Georges Univ Hosp NHS Fdn Trust, Dept Gastroenterol, London, England
[23] Univ Ioannina, Dept Internal Med, Div Gastroenterol, Sch Hlth Sci, Ioannina, Greece
[24] Newcastle Univ, Translat & Clin Res Inst, Newcastle Upon Tyne, Tyne & Wear, England
[25] Royal Victoria Infirm, Dept Gastroenterol, Newcastle Upon Tyne, Tyne & Wear, England
[26] Northern Care Alliance NHS Fdn Trust, Dept Gastroenterol, Manchester, Lancs, England
[27] Univ Manchester, Dept Gastroenterol, Manchester, Lancs, England
[28] Worcestershire Acute Hosp NHS Trust, Dept Surg, Worcester, England
[29] Linkoping Univ Hosp, Dept Surg, Linkoping, Sweden
[30] Linkoping Univ, Dept Biomed & Clin Sci, Linkoping, Sweden
[31] Addenbrookes Hosp, Cambridge Univ Hosp, Dept Gastroenterol, Cambridge, England
[32] Natl & Kapodistrian Univ Athens, Aretaieion Hosp, Dept Surg, Athens, Greece
[33] Inst Invest Biosanitaria IbsGRANADA, Granada, Spain
[34] Escuela Andaluza Salud Publ EASP, Granada, Spain
[35] CIBER Epidemiol & Publ Hlth CIBERESP, Madrid, Spain
[36] Guys & St Thomas NHS Fdn Trust, Dept Gastroenterol, London, England
[37] Kings Coll London, Fac Life Sci & Med, London, England
[38] Univ Hosp Birmingham, Dept Surg, Birmingham, W Midlands, England
[39] Austin Hlth, Dept Surg, Heidelberg, Vic, Australia
[40] Royal London Hosp, Barts Hlth NHS Trust, Dept Gastroenterol, London, England
[41] Hull Univ Teaching Hosp NHS Trust, Dept Gastroenterol, Kingston Upon Hull, Yorks, England
[42] Univ Melbourne, Northern Hosp Epping, Dept Gastroenterol, Melbourne, Vic, Australia
[43] Leeds Teaching Hosp NHS Trust, Dept Gastroenterol, Leeds, W Yorkshire, England
[44] Nottingham Univ Hosp, Dept Surg, Nottingham, England
[45] Univ Hosp Leuven, Dept Surg, Leuven, Netherlands