1. Department of Surgery Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Tokyo Japan
2. Department of Gastrointestinal Surgery Kanagawa Cancer Center Yokohama Japan
3. Department of Surgery National Cancer Center Hospital Tokyo Japan
4. Department of Surgery Japan Community Health Care Organization Osaka Hospital Osaka Japan
5. Department of Gastroenterological Surgery Graduate School of Medicine Osaka University Suita Japan
6. Department of Surgery Osaka Police Hospital Osaka Japan
7. Department of Gastrointestinal Surgery Kansai Rosai Hospital Amagasaki Japan
8. Department of Surgical Pathology Hyogo College of Medicine Nishinomiya Japan