Institution: | (1) Department of General Internal Medicine, Saitama Medical University, 38 Morohongo, Moroyama-machi, Iruma-gun, Saitama 350-0495, Japan;(2) Center for Diagnostic and Therapeutic Endoscopy, School of Medicine, Keio University, Tokyo, Japan;(3) Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan |