1 Departments of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa, and Department of Gastroenterological Surgery, Ehime Rosai Hospital, Ehime, Japan.
2 Department of Pharmacology, Faculty of Medicine, Kagawa University, Kagawa, Japan.
3 Departments of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa, Japan.
4 Department of Gastroenterological Surgery, Ehime Rosai Hospital, Ehime, Japan.
5 Departments of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Kagawa, Japan.