1AugerJ,KunstmanJM,Czyglik F,et al.Decline in semen quality among fertile man in Paris during the past 20 years[J] ,Engl J Med,1995,332(5):281-285.
2Chia SE,OngCN,ChuaLH,etal.Comparison of zinc concentrations in blood and seminal plasma and the various sperm parameters between fertile and infertile men[J].JAndrol,2000,21(1):53-57.
