1. Department of Gastroenterological Surgery, Cancer Institute Hospital Japanese Foundation for Cancer Research Tokyo Japan
2. Division of Surgical Oncology, Department of Surgery Nagoya University Graduate School of Medicine Nagoya Japan
3. Department of Hepatobiliary‐Pancreatic Surgery Juntendo University Graduate School of Medicine Tokyo Japan
4. Department of Diagnostic Imaging, Cancer Institute Hospital Japanese Foundation for Cancer Research Tokyo Japan
5. Department of Thoracic Surgical Oncology, Cancer Institute Hospital Japanese Foundation for Cancer Research Tokyo Japan