1. Division of Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
2. Department of Internal Medicine, Nishinomiya Kyoritsu Neurosurgical Hospital, Hyogo, Japan
3. Department of Internal Medicine, Kyoritsu Hospital, Hyogo, Japan
4. Department of Internal Medicine, Amagasaki Central Hospital, Hyogo, Japan
5. Division of Gastroenterology, Takarazuka Municipal Hospital, Hyogo, Japan