Affiliation: | 1. Department of Surgery, Mayo Clinic and Mayo Foundation, Rochester, MN;2. Division of Biostatistics, Mayo Clinic and Mayo Foundation, Rochester, MN;1. Division of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts;2. Division of Gastroenterology and Hepatology, New York-Presbyterian Hospital/Weill Cornell Medical College, New York, New York;1. Royal Derby Hospital, Derby, UK;2. St James Hospital, Leeds, UK |