[Zhang, Huihui; Xu, Hanfeng; Deng, Shidong; Huang, Zhongxin] Univ South China, Affiliated Hosp 1, Hengyang Med Sch, Dept Urol, 69 Chuanshan Rd, Hengyang 421001, Hunan, Peoples R China.
[Zhang, Huihui] Univ South China, Inst Hosp Adm, Hengyang 421001, Hunan, Peoples R China.
[Yu, Shuang] Peoples Hosp Liuyang, Dept Urol, Changsha 410399, Hunan, Peoples R China.
[Fei, Kuilin] Cent South Univ, Xiangya Hosp, Dept Obstet, Changsha 410008, Hunan, Peoples R China.