1. Department of Surgery, Fujita Health University
2. Department of Surgery, Kurume University
3. Department of gastroenterology, Sapporo City General Hospital
4. Department of Surgery, Toyohashi Municipal Hospital
5. Department of Surgery, Fukuiken Saiseikai Hospital
6. Department of Surgery, Ishikawa Prefectural Central Hospital
7. Department of Surgery, Kanazawa Red Cross Hospital
8. Department of Clinical oncology, Keiyukai Sapporo hospital
9. Department of Surgery, Toyama City Hospital
10. Center for Outcomes Research and Economic Evaluation for Health, National Institute of Public Health (NIPH)
11. Clinical Research Support Center Kyushu
12. Fujita Health University Hospital International Medical center