1. Department of Human Anatomy, Jilin University, Changchun, Jilin, China
2. Department of Breast Surgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
3. Department of Gastrointestinal, Colorectal and Anal Surgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
4. Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China