5Chitty L. Prenatal screening for chromosome abnormalities [ J ]. Birth Medical Bulletin, 1998,54:839 - 856.
6Freemans,Grantham M,Hassold T,et al.Cytogenctic and molecular strdies of luman spontancous abortions[J].Am J Hum Genet,1991(Suppl) A,49:916.
7Rolert O,Elic J,Garmit S,et al.Serum screening for Down syndrome and adversa pregnancy outcomes; a case-comtrolled study[J].Prenat Diagn,2000,20:96-99.
8Palomaki GE,Neveux LM.Using multiples of the median to wormalize serum protein measure ments[J].Clin Chem Lab Med,2001 Non,39(11):13-45.
9Wenstrom KD,Owen J,Chu DC,et al. α- Fetoprotein,free β- human chorionic gonadotropin, and dimeric inhibin Aproduce the best results in a three - analyte, multiple - marker screening test for fetal Down, s syndrome [ J ]. Am J Obstet Gynecol, 1997,177 ( 5 ) : 987 - 991.