1. Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa 761‑0793, Japan
2. Life Science Research Center, Faculty of Medicine, Kagawa University, Kagawa 761‑0793, Japan
3. Department of Immunology, Faculty of Medicine, Kagawa University, Kagawa 761‑0793, Japan
4. Department of Gastroenterological Surgery, Faculty of Medicine, Kagawa University, Kagawa 761‑0793, Japan