From the Departments of Interdisciplinary Endoscopy (Y.B.W., T.N., T.R.), Epidemiology and Statistics (J.F.K.), and General, Visceral, and Thoracic Surgery (O.M., J.I.), University Hospital Hamburg-Eppendorf, and the Department of Surgery, Israelitic Hospital (A.E.), Hamburg, the Department of Surgery, University Hospital Würzburg, Würzburg (B.H.A.R., C.-T.G.), and the Department of Gastroenterology, University Hospital Augsburg, Augsburg (H.M.) - all in Germany; the Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, and the Department of Surgery, Ersta Hospital, Stockholm (B.H.); the Department of Hepatogastroenterology, Institute for Clinical and Experimental Medicine (J.M.), and the 3rd Department of Surgery, 1st Faculty of Medicine, Charles University in Prague and University Hospital Motol (A.P.) - all in Prague, Czech Republic; the Departments of Gastroenterology (A.R.) and Digestive Surgery (U.F.), Istituto Clinico Humanitas Rozzano, and the Department of Digestive Surgery, IRCCS Ospedale San Raffaele (R.R.) - both in Milan; Amsterdam University Medical Centers location AMC, Amsterdam Gastroenterology and Metabolism (A.J.B., P.F.) and Surgery (M.P.S.), University of Amsterdam, Amsterdam; the Department of Gastroenterology and Hepatology, University Hospitals Leuven, and Translational Research Center for Gastrointestinal Disorders, Katholieke Universiteit Leuven, Leuven, Belgium (R.B., G.B.); the Department of Psychology, Harvard University, Cambridge, MA (M.C.V.); and the Division of Gastroenterology, Montreal University Hospital and Research Center, Montreal (D.R.).