1. Department of Gastroenterology, Hyogo Prefectural Kakogawa Medical Center, Kakogawa, Hyogo, Japan
2. Division of Gastroenterology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
3. Department of Diagnostic Pathology, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan
4. Department of Radiology, Hyogo Prefectural Kakogawa Medical Center, Kakogawa, Hyogo, Japan