1 Department of Hepatobiliary and Pancreatic Surgery, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Chiba, 277-8577, Japan. [email protected].
2 Department of Biostatistics, Yokohama City University, Yokohama, Japan.
3 Department of Gastrointestinal Surgery, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan.
4 Department of Hepato-Biliary-Pancreatic Surgery, Sizuoka Cancer Center Hospital, Shizuoka, Japan.
5 Department of Digestive Surgery, Toranomon Hospital, Tokyo, Japan.
6 Department of Hepatobiliary and Pancreatic Surgery, National Cancer Center Hospital East, 6-5-1 Kashiwanoha, Kashiwa, Chiba, 277-8577, Japan.
7 Department of Hepatobiliary and Pancreatic Surgery, National Cancer Center Hospital, Tokyo, Japan.