1. Gastrointestinal Colorectal and Anal Surgery, China‑Japan Union Hospital of Jilin University, Changchun, Jilin 130033, P.R. China
2. Department of Breast Surgery, China‑Japan Union Hospital of Jilin University, Changchun, Jilin 130033, P.R. China
3. Department of Endoscopy Center, China‑Japan Union Hospital of Jilin University, Changchun, Jilin 130033, P.R. China