1. Department of Gastroenterology, Tottori Municipal Hospital, Tottori, Japan
2. Division of Endoscopy, Kaken Hospital, International University of Health and Welfare, Ichikawa, Japan
3. Department of Gastroenterology, Faculty of Medicine, Shimane University, Izumo, Japan
4. Department of General Internal Medicine, Tottori Municipal Hospital, Tottori, Japan
5. Department of Pathology, Tottori Municipal Hospital, Tottori, Japan