1. Department of Gastroenterology, Gunma Saiseikai Maebashi Hospital, Japan
2. Department of Gastroenterology and Hepatology, Gunma University Graduate School of Medicine, Japan
3. Department of Gastroenterology, Shibukawa Medical Center, National Hospital Organization, Japan
4. Department of Internal Medicine, Isesaki Municipal Hospital, Japan
5. Department of Internal Medicine, Kiryu Kosei General Hospital, Japan
6. Department of Gastroenterology, Tomioka General Hospital, Japan
7. Department of Internal Medicine, Toho Hospital, Japan
8. Department of Internal Medicine, Haramachi Red Cross Hospital, Japan
9. Department of Gastroenterology, Takasaki General Medical Center, National Hospital Organization, Japan
10. Department of Gastroenterology and Hepatology, Kusunoki Hospital, Japan