7Allamaneni SS, Naughton CK, Sharrna RK, et al. Increased sem- inal reactive oxygen species levels in patients with varicoceles correlate with varicocele grade but not with testis size [J]. Fertil Steril, 2004,82 (6) : 1684-1686.
8Ozbek E, Turkoz Y, Gokdeniz R, et al. Increased nitric oxide production in the spermatic vein of patients with varicocele [J]. Eur Urol, 2000,37 (2) : 172-175.
9Devoto E, Madariaga M, Lioi X. Causes of male infertility. The contribution of the endocrine factor[J]. Rev Med Chi, 2000,128 (2) : 184-192.
10Pasqualotto FF, Lucon AM, de Goes PM, et al. Semen profile, testicular volume, and hormonal levels in infertile patients with varicoceles compared with fertile men with and without varicoce- les[J]. Fertil Steril, 2005,83 ( 1 ) : 74-77.