Affiliation: | aDepartment of Internal Medicine (S.N., K.D.C., C.Y., Y.C., H.J.S., G. H.L., H.-Y.J., J.-H.K.), Division of Gastroenterology (K.D.C., H.J.S., G.H.L., H.-Y.J., J.-H.K.), Department of Pathology (K.-J.C.), Asan Medical Center, University of Ulsan, Seoul, Korea |