1. Department of Hepatobiliary-Pancreatic Surgery, China-Japan Union Hospital, Jilin University, Changchun, China;
2. Department of Gastrointestinal Colorectal and Anal Surgery, China-Japan Union Hospital, Jilin University, Changchun, China;
3. Department of Anesthesiology, China-Japan Union Hospital, Jilin University, Changchun, China