[Yao, Yanru; Ding, Ning; Luo, Hongbiao; Zhang, Tao] Hunan Univ Chinese Med, Changsha 410208, Hunan, Peoples R China.
[Luo, Hongbiao] Chenzhou 1 Peoples Hosp, Dept Anorectal Surg, Chenzhou 423000, Peoples R China.
[Peng, Tianshu] Hunan Univ Chinese Med, Affiliated Hosp 2, Dept Anorectal Surg, Changsha 410005, Hunan, Peoples R China.
[He, Yongheng] Hunan Acad Tradit Chinese Med, Affiliated Hosp, Dept Anorectal Surg, Changsha 410006, Hunan, Peoples R China.