1. Department of Upper‐gastrointestinal Surgery Kitasato University School of Medicine Kanagawa Japan
2. Department of General Pediatric and Hepatobiliary‐Pancreatic Surgery Kitasato University School of Medicine Kanagawa Japan
3. Department of Lower Gastrointestinal Surgery Kitasato University School of Medicine Kanagawa Japan
4. Department of Breast and Thyroid Surgery Kitasato University School of Medicine Kanagawa Japan
5. Division of Advanced Surgical Oncology Department of Research and Development Center for New Medical Frontiers Kitasato University School of Medicine Kanagawa Japan