Affiliation: | (1) Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, 54 Shogoin-Kawahara-cho, Sakyo-ku Kyoto, 606-8507, Japan;(2) Department of Gastroenterology, J.R. West Osaka General Hospital, Osaka, Japan;(3) Department of Surgery, J.R. West Osaka General Hospital, Osaka, Japan;(4) Department of Gastroenterology, Nara Hospital, Kinki University Graduate School of Medicine, Nara, Japan |