1. Department of Gastroenterological Surgery Hiroshima Prefectural Hospital Hiroshima Japan
2. Department of Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences Hiroshima University Hiroshima Japan
3. HiSCO: Hiroshima Surgical study group of Clinical Oncology Hiroshima Japan
4. Department of Surgery Chugoku Rosai Hospital Kure Japan
5. Department of Surgery JA Onomichi General Hospital Onomichi Japan
6. Department of Surgery National Hospital Organization Higashihiroshima Medical Center Higashihiroshima Japan
7. Department of Surgery National Hospital Organization Kure Medical Center and Chugoku Cancer Center Kure Japan
8. Department of Surgery Hiroshima City North Medical Center, Asa Citizens Hospital Hiroshima Japan