1. 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,...