1 Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China.
2 Department of General Surgery, BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, People's Republic of China.
3 Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China. lygwxw@163.com.
4 Department of General Surgery, BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, People's Republic of China. zhaoyun056@gmail.com.
5 Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China. jiananr@gmail.com.