Affiliation: | 1.Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Japan; 2.Department of Gastroenterology and Hepatology, National Hospital Organization Osaka National Hospital, Japan; 3.Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, Japan; 4.Department of Gastroenterological Surgery, Osaka University Graduate School of Medicine, Japan |