From the Department of Gastroenterology and Hepatology, Kyoto University, Kyoto; Divisions of Gastrointestinal Oncology/Endoscopy and Pathology, National Cancer Center Hospital East, Kashiwa; Divisions of Endoscopy and Pathology, National Cancer Center Hospital; Department of Gastroenterology and Hepatology, Tokyo Jikei University, Tokyo; Department of Surgery, Kawasaki City Municipal Hospital, Kawasaki; Department of Surgery, Showa University Yokohama Northern Hospital, Yokohama; Department of Hygiene... (At 2010-03-20)