[1] Anhui Med Univ, Dept Urol, Affiliated Hosp 1, Hefei, Anhui, Peoples R China
[2] Wannan Med Coll, Dept Urol, Affiliated Hosp 2, Wuhui, Anhui, Peoples R China
[3] Nanjing Univ, Sch Med, Dept Androl, Affiliated Drum Tower Hosp, Nanjing, Jiangsu, Peoples R China
[4] Peking Univ, Hosp 3, Dept Urol, Beijing, Peoples R China
[5] Peking Univ, Dept Human Sperm Bank, Hosp 3, Beijing, Peoples R China
[6] Peking Univ, Dept Androl, Hosp 3, Beijing, Peoples R China