[1] Katholieke Univ Leuven, Univ Hosp Leuven, Dept Gastroenterol & Hepatol, Herestr 49, B-3000 Leuven, Belgium
[2] Portuguese Oncol Inst, Dept Gastroenterol, Coimbra, Portugal
[3] Univ Porto, Ctr Hlth Technol & Serv Res CINTESIS, Fac Med, Oporto, Portugal
[4] CHU Nantes, Inst Malad Appareil Digestif, Nantes, France
[5] Univ Med & Pharm, Dept Gastroenterol, Targu Mures, Romania
[6] Univ Pittsburgh, Dept Environm & Occupat Hlth, Pittsburgh, PA USA
[7] Yaroslavl Reg Canc Hosp, Endoscopy, Yaroslavl, Russia
[8] Barmherzige Bruder Regensburg, Klin Gastroenterol & Intervent Endoskopie, Regensburg, Germany
[9] Nottingham Univ Hosp NHS Trust, NIHR Nottingham Digest Dis Biomed Res Unit, Queens Med Ctr Campus, Nottingham, England
[10] St Antonius Hosp, Dept Gastroenterol & Hepatol, Nieuwegein, Netherlands
[11] Agostino Gemelli Univ Hosp, Digest Endoscopy Unit, Rome, Italy
[12] Josephs Hosp, Dept Internal Med, Warendorf, Germany
[13] Gloucestershire Hosp NHS Fdn Trust, Dept Gastroenterol, Gloucester, Glos, England
[14] Univ Oslo, Dept Hlth Management & Hlth Econ, Oslo, Norway
[15] Univ Oslo, KG Jebsen Ctr Colorectal Canc, Oslo, Norway
[16] Maria Sklodowska Curie Mem Canc Ctr, Dept Gastroenterol Oncol, Warsaw, Poland
[17] Inst Oncol, Warsaw, Poland
[18] Med Ctr Postgrad Educ, Warsaw, Poland
[19] Oslo Univ Hosp, Dept Transplantat Med, Oslo, Norway
[20] Coventry Univ, Ctr Technol Enabled Res, Fac Hlth & Life Sci, Coventry, W Midlands, England
[21] AOU Citta Salute & Sci, CPO Piemonte, Turin, Italy
[22] Inst Portugues Oncol Francisco Gentil, Serv Gastroenterol, Oporto, Portugal
[23] Univ Hosp North Tees, Dept Gastroenterol, Stockton On Tees, Cleveland, England
[24] Univ Durham, Sch Med, Durham, England