2Chi I C.What We Have Learn From Recent IUD Studies[J].Contraception,1993,48(2):81-81.
3María Elena Ortiz,Horacio B.Croxatto.Copper-T intrauterinedevice and levonorgestrel intrauterine system:biological bases oftheir mechanism of action[J].Contraception,2007,75:16-30.
4Xue H S,Xu N X,Zhang C D.Corrosion behavior of copperin a copper bearing intrauterine devices[J].Contraception,1998,57(1):49-53.
5Elchalal.U,Abramov.Y.Uterine biology and the intrauterinedevice[J].Advanced drug delivery reviews,1995,17(2):151-164.