1. Graduate Department of Shanxi Medical University, Taiyuan, China.
2. Department of General Surgery, The First Affiliated Hospital of Shanxi Medical University, Taiyuan, China.
3. Department of General Surgery, The Second Hospital of Shanxi Medical University, Taiyuan, China.
4. Department of General Surgery, Chinese PLA General Hospital, Beijing, China.
5. Department of General Surgery, The Second Affiliated Hospital of Shanxi Medical University, Taiyuan, China.