1. Department of General Surgery, Affiliated Hongqi Hospital of Mudanjiang Medical University, Mudanjiang 157011, Heilongjiang, China
2. Internal Medicine Oncology, Affiliated Hongqi Hospital of Mudanjiang Medical University, Mudanjiang 157011, Heilongjiang, China
3. Department of Anatomy, Mudanjiang Medical University, Mudanjiang 157011, Heilongjiang, China