[Tu, Menjiang; Ai, Kai] Cent S Univ, Dept Urol, Xiangya Hosp 2, Changsha, Hunan, Peoples R China.
[Sun, Mai] Cent S Univ, Dept Otolaryngol, Xiangya Sch Med, Changsha, Hunan, Peoples R China.
[Liu, Yonggang] Hengyang Normal Coll, Dept Sports Med, Hengyang, Peoples R China.
[Guo, Bowen] Cent S Univ, Xiangya Sch Med, Changsha, Hunan, Peoples R China.
[Zhao, Jiapeng] Cent S Univ, Dept Neurosurg, Xiangya Sch Med, Changsha, Hunan, Peoples R China.