1. Division of Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
2. Division of Inflammatory Bowel Disease, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
3. Tanaka Naika Clinic, Mikage, Hyogo, Japan
4. Department of Public Health, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan