1Ogilvie CM. Prenatal diagnosis for chromosome abnormalities past, present and future[J]. Pathol Biol (Paris), 2003,51 (3) : 156- 160.
2Jelliffe-Pawlowski LL, Walton-Haynes L, Gurrier RJ. Identification of second trimester screen positive pregnancies at increased risk for congenital heart defects[J]. Prenat Diagn, 2009, 29(6) :570-577.
3Kang JH,Farina A, Park JH, et al. Down syndrome biochemical markers and screening for preeclampsia at first and second trimester: correlation with the week of onset and the severity[J]. Prenat Diagn,2008,28(8) :704-709.