1. Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kita, Kagawa, Japan
2. Department of Clinical Oncology, Faculty of Medicine, Kagawa University, Kita, Kagawa, Japan
3. Department of Gastroenterological Surgery, Kagawa University, Kita, Kagawa, Japan
4. Department of Pharmacology, Faculty of Medicine, Kagawa University, Kita, Kagawa, Japan