1. Division of Gastroenterology; Department of Internal Medicine; Hyogo College of Medicine; Hyogo Japan
2. Hyogo Health Service Association; Hyogo Japan
3. Department of Internal Medicine; Amagasaki Central Hospital; Hyogo Japan
4. Department of Gastroenterology; Shinko Kakogawa Hospital; Hyogo Japan
5. Department of Internal Medicine; Nishinomiya Kyoritsu Neurosurgical Hospital; Hyogo Japan