1. Department of Hepatobiliary‑Pancreatic Surgery, China‑Japan Union Hospital of Jilin University, Changchun, Jilin 130033, P.R. China
2. Department of Ultrasound, China‑Japan Union Hospital of Jilin University, Changchun, Jilin 130033, P.R. China
3. Office of Surgical Nursing, Changchun Medical College, Changchun, Jilin 130000, P.R. China