1. Department of Medicine, Division of Gastroenterology, Jichi Medical University, Japan
2. Department of Gastroenterology, Dokkyo Medical University, Japan
3. Department of Gastroenterology, Saiseikai Utsunomiya Hospital, Japan
4. Department of Gastroenterology, Nasu Red Cross Hospital, Japan
5. Department of Gastroenterology, Shin-Oyama City Hospital, Japan
6. Department of Internal Medicine, Nasu Minami Hospital, Japan
7. Department of Gastroenterology, Tochigi Medical Center Shimotsuga, Japan
8. Department of Gastroenterology, Sano Kousei General Hospital, Japan
9. Department of Gastroenterology, Haga Red Cross Hospital, Japan
10. Department of Gastroenterology, Tochigi Medical Center, Japan
11. Department of Gastroenterology, Koga Red Cross Hospital, Japan
12. Department of Gastroenterology, JCHO Utsunomiya Hospital, Japan
13. Department of Internal Medicine, Utsunomiya Higashi Hospital, Japan
14. Department of Gastroenterology, Ashikaga Red Cross Hospital, Japan
15. Department of Internal Medicine, Kamitsuga General Hospital, Japan
16. Department of Gastroenterology, Yuai Memorial Hospital, Japan