[1] Sun Yat Sen Univ, Affiliated Hosp 6, Dept Colorectal Surg, Guangzhou 510655, Guangdong, Peoples R China
[2] Sun Yat Sen Univ, Affiliated Hosp 6, Dept Gen Surg, Guangzhou 510655, Guangdong, Peoples R China
[3] Sun Yat Sen Univ, Affiliated Hosp 6, Guangdong Prov Key Lab Colorectal & Pelv Floor Dis, Guangzhou 510655, Guangdong, Peoples R China
[4] Sun Yat Sen Univ, Affiliated Hosp 6, Dept Pathol, Guangzhou 510655, Guangdong, Peoples R China