[1] Univ Amsterdam, Amsterdam Univ Med Ctr, Locat Acad Med Ctr, Dept Gastroenterol & Hepatol, Meibergdreef 9, NL-1105 AZ Amsterdam, Netherlands
[2] Althaia Xarxa Assistencial Univ Manresa, Digest Dis Dept, Manresa, Spain
[3] Univ Vic, Univ Cent Catalunya UVic UCC, Fac Ciencies Salut, Dept Med, Manresa, Spain
[4] La Fe Polytech Univ Hosp, Digest Dis Dept, Gastrointestinal Endoscopy Unit, Valencia, Spain
[5] La Fe Hlth Res Inst, Gastrointestinal Endoscopy Res Grp, Valencia, Spain
[6] Univ Nantes, CHU Nantes, Inst Malad Appareil Digestif IMAD, Nantes, France
[7] Cty Hosp Mures, Dept Gastroenterol, Targu Mures, Romania
[8] Yaroslavl Reg Canc Hosp, Endoscopy Dept, Yaroslavl, Russia
[9] Pirogov Russian Natl Res Med Univ, Fac Addit Profess Educ, Dept Gastroenterol, Moscow, Russia
[10] Univ Med Ctr Mainz, Dept Med 1, Mainz, Germany
[11] Univ Coll London Hosp, Dept Gastroenterol, London, England
[12] Portuguese Oncol Inst Porto, Dept Gastroenterol, Porto, Portugal
[13] Univ Porto, Fac Med, Ctr Res Hlth Technol & Informat Syst CINTESIS, Porto, Portugal
[14] Univ Porto, Fac Med, Surg & Physiol Dept, Porto, Portugal
[15] Royal Hallamshire Hosp, Acad Unit Gastroenterol, Sheffield, S Yorkshire, England
[16] Erasme Univ Hosp, Dept Gastroenterol Hepatopancreatol & Digest Onco, Brussels, Belgium
[17] Hop Edouard Herriot, Div Gastroenterol, Lyon, France
[18] Univ Oxford, John Radcliffe Hosp, Div Expt Med, Translat Gastroenterol Unit,Nuffield Dept Med, Oxford, England
[19] Univ Oxford, Oxford Natl Inst, Hlth Res Biomed Res Ctr, Oxford, England
[20] Univ Hosp Leuven, TARGID, Catholic Univ Leuven KUL, Dept Gastroenterol & Hepatol, Leuven, Belgium