[Yin, Zhihui] Univ South China, Affiliated Hosp 1, Dept Anorectal Dis, Hengyang 421001, Hunan, Peoples R China.
[Yi, Jian] Hunan Univ Tradit Chinese Med, Hosp 1, Key Lab Internal Med, Changsha 410007, Hunan, Peoples R China.
[Nie, Tian] Hunan Univ Chinese Med, Affiliated Hosp 1, Dept Blood & Oncol, Changsha 410007, Hunan, Peoples R China.
[Du, Shou Xian; Yang, Zongliang; Ding, Ning; Peng, Tianshu; Liu, Shan Shan] Hunan Univ Chinese Med, Affiliated Hosp 2, Dept Anorectal Dis, 233 Cai E North Rd, Changsha 410005, Hunan, Peoples R China.