1. Division of Gastroenterology; Department of Medicine; Kurume University School of Medicine; 67 Asahi-machi Kurume Fukuoka 830-0011 Japan
2. Department of Diagnostic Pathology; Kurume University Hospital; Kurume Fukuoka Japan
3. Department of Surgery; Iizuka City Hospital; Iizuka Fukuoka Japan
4. Department of Surgery; Kurume University School of Medicine; Kurume Fukuoka Japan