1. Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka 830‑0011, Japan
2. Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755‑8505, Japan
3. Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School of Medicine, Tokushima 770‑8504, Japan
4. Department of Gastroenterology and Hepatology, Nagoya University Graduate School of Medicine, Nagoya, Aichi 466‑8560, Japan
5. Department of Gastroenterology and Neurology, Kagawa University, Faculty of Medicine, Takamatsu, Kagawa 761‑0793, Japan
6. Department of Regenerative Medicine, Center for Innovative Clinical Medicine, Okayama University Hospital, Okayama 700‑8558, Japan
7. Department of Gastroenterology and Hepatology, Japanese Red Cross Aichi Medical Center Nagoya Daiichi Hospital, Nagoya, Aichi 453‑8511, Japan
8. Department of Gastroenterology, Toyohashi Municipal Hospital, Toyohashi, Aichi 441‑8570, Japan
9. Department of Gastroenterology, Anjo Kosei Hospital, Anjo, Aichi 446‑8602, Japan
10. Department of Clinical Research, National Hospital Organization Takasaki General Medical Center, Takasaki, Gunma 370‑0829, Japan
11. Department of Gastroenterology, Gunma Saiseikai Maebashi Hospital, Maebashi, Gunma 371‑0821, Japan
12. Department of Gastroenterology, Kawasaki Medical School, Kurashiki, Okayama 701‑0192, Japan
13. Department of Gastroenterology, Fukuyama City Hospital, Fukuyama, Okayama 721‑8511, Japan
14. Department of Gastroenterology, Fukuyama Medical Center, Fukuyama, Okayama 720‑8520, Japan
15. Department of Gastroenterology and Hepatology, Kurume Central Hospital, Kurume, Fukuoka 830‑0001, Japan
16. Division of Laboratory, Yamaguchi University Hospital, Ube, Yamaguchi 755‑8505, Japan
17. Department of Gastroenterology, National Hospital Organization Takasaki General Medical Center, Takasaki, Gunma 370‑0829, Japan
18. Department of Gastroenterology and Hepatology, Okayama University Hospital, Okayama 700‑8558, Japan