1. Department of Gastroenterological Surgery; Fukuoka University School of Medicine; Fukuoka Japan
2. Department of General Thoracic, Breast, and Pediatric Surgery; Fukuoka University School of Medicine; Fukuoka Japan
3. Department of Pathology; Fukuoka University Faculty of Medicine; Fukuoka Japan
4. Digestive Disease Center; Showa University Koto-Toyosu Hospital; Tokyo Japan