1. Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka 830‑0011, Japan
2. Division of Gastroenterology, Department of Medicine, Yame General Hospital, Yame, Fukuoka 834‑0034, Japan
3. Division of Gastroenterology, Department of Medicine, Yokokura Hospital, Miyama, Fukuoka 839‑0295, Japan