Affiliation: | (1) Division of Digestive and General Surgery, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuou-ku, Niigata City 951-8510, Japan;(2) Department of Endoscopy, Niigata University Medical and Dental Hospital, Niigata City, Japan;(3) Division of Gastroenterology and Hepatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata City , Japan |