1. Department of Gastroenterology Kyoto Second Red Cross Hospital Kyoto Japan
2. Department of Gastroenterology National Hospital Organization Kyoto Medical Center Kyoto Japan
3. Department of Gastroenterology Japanese Red Cross Kyoto Daiichi Hospital Kyoto Japan
4. Digestive Disease Center, Department of Gastroenterology and Hepatology Kyoto Katsura Hospital Kyoto Japan
5. Division of Gastroenterology, Department of Medicine Shiga University of Medical Science Otsu Japan