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