1. Department of Forensic Medicine, Shanxi Medical University, Taiyua, Shanxi 030001, China
2. Department of General Surgery, First Hospital of Shanxi Medical University, Taiyua, Shanxi 030001, China
3. Department of General Surgery, First Clinical Medical College of Shanxi Medical University, Taiyua, Shanxi 030001, China
4. Department of General Surgery, Second Clinical Medical College of Shanxi Medical University, Taiyua, Shanxi 030001, China