1 Department of Surgical Oncology, The First Hospital of China Medical University, Shenyang, China.
2 Department of Anesthesiology, The First Hospital of China Medical University, Shenyang, China.
3 Department of Gastrointestinal Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Peking University Cancer Hospital and Institute, Beijing, China.