1. Division of Gastroenterology, Department of Medicine; Kurume University School of Medicine; Kurume Fukuoka Japan
2. Division of GI Endoscopy, Digestive Disease Center; Kurume University Hospital; Kurume Fukuoka Japan
3. Division of Gastroenterology; Yanagawa Hospital; Yanagawa Fukuoka Japan
4. Unit of Gastroenterology and GI Endoscopy; Yasumoto Hospital; Kurume Fukuoka Japan