Affiliation: | Current affiliations: Department of Internal Medicine and Institute of Gastroenterology (J.J.P., J.H.C., H.S.P., C.M.M., J.H.L., S.P.H., T.I.K., W.H.K.), Yonsei University College of Medicine, Seoul, South Korea, Division of Gastroenterology (H.M.K.), Department of Internal Medicine, Kwandong University College of Medicine, Seoul, South Korea |