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