1. Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
2. Department of Surgery, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
3. Department of Hepatobiliary and Pancreatic Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
4. Morinomiya Clinic, Osaka, Japan