1Clementi M, Bianca S,Tenconi R. Re: "parity and the risk of Down's syndrome". Am J Epidemiol,2004, 160(6) :610
2Dzurova D,Pikhart H.Down syndrome, paternal age and education:comparison of California and the Czech Republic. BMC Public Health,2005,5 ( 1 ) :69
3Spencer K. First trimester maternal serum screening for Down's syndrome: an evaluation of the DPC Immulite 2000 free beta-hCG and pregnancy-associated plasma protein-A assays. Ann Clin Biochem,2005,42 (pt 1 ):30-40
4Bersinger NA,Wunder D, Vanderlick F,et al. Maternal serum levels of placental proteins after in vitro fertilisation and their implications for prenatal screening. Prenat Diagn, 2004,24 (6) :471-477
5Christiansen M. Norgaard-Pedersen B.Inhibin A is a maternal serum marker for Down's syndrome early in the first trimester.Clin Genet,2005,68 ( 1 ):35-39
6Locatelli A, Mariani S, Ciriello E,et al.Role of FISH on uncultured amniocytes for the diagnosis of aneuploidies in the presence of fetal anomalies.Fetal Diagn Ther, 2005,20( 1 ):1-4
7Witters I, Devriendt K, Legius E, et al. Rapid prenatal diagnosis of trisomy 21 in 5049 consecutive uncultured amniotic fluid samples by fluorescence in situ hybridisation (FISH). Prenat Diagn, 2002, 22( 1 ): 29-33
8Zimmermann B,El-Sheikhah A,Nicolaides K, et al. Optimized real-time quantitative PCR measurement of male fetal DNA in maternal plasma. Clin Chem,2005,51 ( 9 ): 1598-1604
9Yang YH, Nam MS, Yang ES. Rapid prenatal diagnosis of trisomy 21 by real-time quantitative polymerase chain reaction with amplification of small tandem repeats and S100B in chromosome 21.Yonsei Med J, 2005,46 (2): 193-197
10Ochshom Y, Bar-Shira A, Jonish A, et al. Rapid prenatal diagnosis of aneuploidy for chromosomes 21, 18, 13, and X by quantitative fluorescence polymerase chain reaction. Fetal Diagn Ther, 2006,21(4): 326-331
76oodburn SF, Yates JR, Raggatt PR, et al. Second -trimester matemal serum screening using alpha fetoprotein, human ehorioniegonadotropin and unconjugated oestriol: experience of a regional prograrmme[J]. Prenat Diagn, 1994, 14: 391-402.
8Pajkrt E, Mol BW. Van Lith Jm Downs syndrome by fetal et al. Screening for nuchal translucency measurement in a high--risk population[J]. Ultrasound Obstet Gynecol. 1998, 12 (3): 156-162.
9RCOG. The Royal College of Obstetricians and Gynaecologists Report. RCOG,Working Party on Markers and the Detection of Down S Syndrome, London: RCOG1993: 8-14.
10Wald NJ,Watt HC,Hackshaw AK.Integrated Screening for Down's Syndrome Based on Tests Performed during the First and Second Trimesters[J].N Engl J Med,1999,341(7):461-467
