1. Department of Surgery, Osaka Rosai Hospital, Osaka, Japan
2. Department of Gastroenterology, Kitasato University Hospital, Sagamihara, Japan
3. Department of Hepato-Biliary-Pancreatic Surgery, Osaka City University Hospital, Osaka
4. Department of Clinical Oncology, National Hospital Organization Kyoto Medical Center, Kyoto, Japan
5. Department of Gastroenterological Surgery, Hyogo College of Medicine, Nishinomiya, Japan
6. Department of Gastroenterological Surgery, Osaka University Hospital, Suita, Japan
7. Department of Gastroenterological Surgery, Kansai Rosai Hospital, Amagasaki, Japan
8. Department of Surgery, Kansai Medical University, Osaka, Japan
9. Department of Gastroenterology and Hematology, Tomakomai City Hospital, Tomakomai, Japan
10. Center for Gastroenterology, Teine-Keijinkai Hospital, Sapporo, Japan
11. Department of Hepato-Biliary Pancreatic Surgery, Tohoku Medical and Pharmaceutical University Hospital, Sendai, Japan
12. Department of Surgery, Japanese Red Cross Ishinomaki Hospital, Ishinomaki, Japan
13. Department of Surgery, Yamagata Prefectural Central Hospital, Yamagata, Japan
14. Department of Gastroenterology, Japanese Red Cross Medical Center, Tokyo, Japan
15. Department of Surgery, Kasugai Municipal Hospital, Kasugai, Japan
16. Department of Surgery, Ogaki Municipal Hospital, Ogaki, Japan
17. Department of Gastroenterology and Hepatology, Japanese Red Cross Osaka Hospital, Osaka, Japan
18. Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital, Tokyo, Japan