1 Department of General Surgery, The Third People's Hospital of Dalian, Dalian Medical University, Dalian, China.
2 Department of Clinical Medicine (Student ID:122206020311), Dalian Medical University, Dalian, China.
3 Department of General Surgery, The Third People's Hospital of Dalian, Dalian Medical University, Dalian, China. Electronic address: fanzhe1982@hotmail.com.