1. Department of Internal Medicine, Isesaki Municipal Hospital, Japan
2. Department of Gastroenterology, Takasaki General Medical Center, National Hospital Organization, Japan
3. Department of Medicine and Molecular Sciences, Gunma University Graduate School of Medicine, Japan
4. Department of Internal Medicine, Sanshikai Kusunoki Hospital, Japan
5. Department of Gastroenterology, Maebashi Red Cross Hospital, Japan
6. Department of Internal Medicine, Katakai Clinic, Japan