1. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan
2. Department of Pathology, Okayama University Hospital, Okayama 700-8558, Japan
3. Department of Endoscopy, Okayama University Hospital, Okayama 700-8558, Japan