[1] Humanitas Univ, Dept Biomed Sci, Pieve Emanuele, Italy
[2] Univ Oslo, Clin Effectiveness Res Grp, Oslo, Norway
[3] Univ Foggia, Gastroenterol Sect, Dept Med Sci, Foggia, Italy
[4] IRCCS, Endoscopy Unit, Humanitas Clin & Res Ctr, Rozzano, Italy
[5] Kansas City VA Med Ctr, Gastroenterol & Hepatol, Kansas City, KS USA
[6] Univ Toronto, St Michaels Hosp, Ctr Therapeut Endoscopy & Endoscop Oncol, Toronto, ON, Canada
[7] Univ Utah Hlth, Gastroenterol & Hepatol, Salt Lake City, UT USA
[8] Valduce Hosp, Gastroenterol Unit, Como, Italy
[9] Indiana Univ Sch Med, Div Gastroenterol, Indianapolis, IN USA
[10] Portsmouth Hosp Univ NHS Trust, Gastroenterol, Portsmouth, Hants, England