1 Division of Colorectal Surgery, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
2 Department of Medical Research, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
3 Division of Colon and Rectal Surgery, Department of Surgery, Songshan Branch, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
4 Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan.
5 School of Medicine, National Defense Medical Center, Taipei, Taiwan.
6 Department of Medical Research, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan. chienwu@mail.ndmctsgh.edu.tw.