1. Division of Gastroenterology and Nephrology, Department of Multidisciplinary Internal Medicine, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
2. Division of Organ Pathology, Department of Pathology, Faculty of Medicine, Tottori University, Tottori 683-8504, Japan
3. Department of Gastroenterology and Hepatology, Graduate School of Biological Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan