6Wald N J, George L, Smith D, et al. Serum screening for Down's syndrome between 8 and 14 weeks of pregnancy . Br J Obstet Gynaecol , 1996, 103:407.
7Granadons JS. Triple marker screaming for trisomy 21, trisomy 18 and open neural tube. Defects in singleton pregnancies of native Japanese pregnant. Women Jobs Gyn Res,2000,12 : 26.
8HSU JJ, Hsieh TT, Hsieh FJ. Down's syndrome screening in an Asian populatin using alpha - fetoprotein and free B - hcG: areport of the Taiuan Down's syndrome screening gronp. Obstet Gynecol, 1996,87 (6) : 943 - 947.
9Moos MK. Preconceptional health promotion progress in changing a prevention paradigm [ J ]. J Perinat Neonat Nuts, 2004 ; 18 ( 1 ): 2 -13.
