6Calsen E, Giwercman A, Keiding N, et al. Evidence for decreasing quality of semen during past 50years[ Jl. Br Med J, 1992, 305(6854) :609 -613.
7Giwercman A, Carlsen E, Keiding N, et al. Evidence for increasing incidence of abnormalities of the human testis : a review [ J ]. Environ Health Perspect, 1993,101 ( Suppl 2 ) : 65 71.
8Shu -Cheng Zhang, Bin He, Shang Ming Wang, et al. The comparative mechanisms study of Wuziyanzong Pills and Jinkuishenqi Pills on the function of Shenjing and Shenqi [ J ]. Asian Journal of Andrology, 2009,11 ( Suppll ) : 152.
