Hepato-Biliary-Pancreatic Surgery Division Graduate School of Medicine The University of Tokyo Tokyo 113-8655 Japan;
Institute of Hepatobiliary Surgery Southwest Hospital Third Military Medical University Chongqing 400038 China;
Hepatobiliary Surgery Department 302 Military Hospital of China Beijing 100071 China;
Department of Hepatobiliary Tumor Tianjin Medical University Cancer Hospital Tianjin 300060 China;
Institute of Hepatobiliary Surgery Chinese PLA General Hospital Beijing 100039 China;