1. Clinical Research Center, National Nagasaki Medical Center, Omura City, Nagasaki, Japan
2. Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume City, Fukuoka, Japan
3. Department of Surgery, National Hospital Organization Kyushu Medical Center, Chuo-ku, Fukuoka City, Fukuoka, Japan
4. 1st Department of Internal Medicine, Oita University Faculty of Medicine, Hasama-machi, Yufu City, Oita, Japan
5. Department of Hepatology, Fukuoka Red Cross Hospital, Minami-ku, Fukuoka City, Fukuoka, Japan
6. Department of Internal Medicine, Saga University Faculty of Medicine, Saga City, Saga, Japan
7. Department of Gastroenterology and Hepatology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto City, Kumamoto, Japan
8. Department of Internal Medicine II, Miyazaki Medical College, Kiyotake-cho, Miyazaki-gun, Miyazaki, Japan
9. 3rd Department of Internal Medicine, University of Occupational and Environmental Health, Kitakyusyu City, Fukuoka, Japan
10. Department of Hepatology, Nanpuh Hospital, Kagoshima City, Kagoshima, Japan
11. Department of Surgery and Science, Graduate school of medical sciences, Kyushu University, Fukuoka City, Fukuoka, Japan
12. Department of Internal Medicine, Fukuoka Tokusyukai Medical Center, Kasuga City, Fukuoka, Japan
13. Digestive Disease and Life-Style Related Disease, Health Research Human and Environmental Sciences, Kagoshima University, Kagoshima City, Kagoshima, Japan
14. Department of Gastroenterology, National Hospital Organization Oita Medical Center, Oita City, Oita, Japan
15. Department of Gastroenterology and Hepatology, Nagasaki University School of Medicine, Nagasaki City, Nagasaki, Japan
16. Department of Gastroenterology, National Hospital Organization, Kyushu Medical Center, Fukuoka City, Fukuoka, Japan
17. 1st Department of Internal Medicine, Faculty of Medicine, University of the Ryukyus, Nakagami-gun, Okinawa, Japan
18. Department of Gastroenterology, Nagasaki Rousai Hospital, Sasebo City, Nagasaki, Japan