作者单位:Department of Gastroenterology and Hepatology, Okayama University, Graduate School of Medicine[1]Department of Pathology, Okayama University, Graduate School of Medicine, Dentistry, and[2]Department of Endoscopy, Okayama University Hospital, Japan[3]Department of Hematology and Oncology, Okayama University, Graduate School of Medicine, Dentistry[4]