Department of Gastrointestinal Surgery;
the Fourth Affiliated Hospital of China Medical University;
Shenyang 110032;
Liaoning Province;
China;
Department of Gastrointestinal Surgery;
Graduate School of Medicine;
The University of Tokyo;
Tokyo 113-0033;
Japan;
Cancer Center;
the Fourth Affiliated Hospital of China Medical University;
Shenyang 110032;
Liaoning Province;
China;
Low ligation; High ligation; Colorectal cancer; Genitourinary function; Defecatory function; Meta-analysis;