1. Department of Gastrointestinal Colorectal and Anal Surgery, China‑Japan Union Hospital of Jilin University, Changchun, Jilin 130033, P.R. China
2. Department of Hepatobiliary and Pancreatic Surgery, China‑Japan Union Hospital of Jilin University, Changchun, Jilin 130033, P.R. China
3. Department of Neurology, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China