Affiliation: | aCurrent affiliations: Division of Gastroenterology, Department of Internal Medicine, Myongji Hospital, Kwandong University College of Medicine (J.H.C.), Goyang, Korea, Division of Gastroenterology, Department of Internal Medicine, Institute of Gastroenterology (J.Y.P., Y.J.K., H.M.K., H.J.K., S.P.H., S.W.P., J.B.C., S.Y.S., S.B.), Brain Korea 21 Project for Medical Science (S.Y.S.),Yonsei University College of Medicine, Seoul, Korea |