1. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan
2. Department of Gastroenterology, Mitoyo General Hospital, Kan’onji 769-1695, Japan
3. Department of Radiology, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama 700-8558, Japan
4. Department of Practical Gastrointestinal Endoscopy, Okayama University Hospital, Okayama 700-8558, Japan