1. Department of Health Care, Yodogawa Christian Hospital, Japan
2. Division of Gastroenterology, Department of Internal Medicine, Kawasaki Medical School, Japan
3. Division of Gastroenterology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Japan
4. Department of Health Care, Kyoto Second Red Cross Hospital, Japan
5. Department of Gastroenterology, Fukui Red Cross Hospital, Japan
6. Department of Gastroenterology, Kakogawa Central City Hospital, Japan
7. Department of Gastroenterology, Kita-harima Medical Center, Japan
8. Department of Gastroenterology, Saiseikai Nakatsu Hospital, Japan
9. Department of Gastroenterology, Yodogawa Christian Hospital, Japan
10. Center for Clinical Research and Advanced Medicine, Shiga University Medical Science, Japan