1Wald NJ, Kennard A, Hackshaw A, et al. Antenatal screening for Down' s syndrome. Health Technol Assess, 1998, 2(1): 1. 被引量：1
2Spencer K, Berry E,Crossley JA, et al. Is maternal serum total hCG a marker of trisomy 21 in the first trimester of pregancy? Prenat Diagn, 2000,20(4) : 311. 被引量：1
3Beaman JM, Goldie DJ. Second trimester soreening for Down's syndorme: 7 years experience. J Med Screen, 2001, 8(3): 128. 被引量：1
4Cuckle H. Biochemical screening for Down's syndrome. Eur J Obstet Gynecol Reprod Biol, 2000, 92:97. 被引量：1
5Gilbert RE, Augood C, Ades AE, et al. Screening for Down's syndrome:effects, safety, and cost effectiveness of first and second trimester strategies.BMJ, 2001, 323:423. 被引量：1
6Krantz DA, Hallahan TW, Orlandi F, et al. First- trimester Down's syndrome screening using dried bolld biochemistry and unchal translucency. Obstet Gynecol, 2000, 96:(2): 207. 被引量：1
7Cicero S, Curcio P, Papageorghiuo A, et al. Absence of nasla in fetuses with trisomy 21 at 11 - 14 weeks of gestation: an observational study. Latncet,2001, 358:1665. 被引量：1
8Audibert F, Dommergues M, Benattar C, et al. Screening for Down's syndrome using flint - trimester ultrasound and second - trimester matemal serum markers in a low- risk population: a prospective longitudinal study. Ultrasound Obstet Gynecol, 2001, 18(1): 26. 被引量：1
9Gasiorek - Wiens A, Tercanli S, Kozlowski P, et al. Screening for trisomy 21 by fetal nuchal translucency and maternal age: a multicenter project in Germany, Austria and Switzerland. Ultrasound Obstet Gynecol, 2001, 18(6), 645. 被引量：1
10Verma L, Macdonald F, Leedham P, et al. Rapid and simple renatal DNA diagnosis of Dowrn's syndrome, lancet, 1998, 352(9121): 9. 被引量：1
4Stoll C, Alembik Y, Dott B, et al. Impact of prenatal diagnosis on livebirth prevalence of children with congenital anomalies. Ann C, enet,2002, 45 (3) : 115 -121. 被引量：1
5Peller AT, Westgate MN, Holmes LB. Trends in Congenital Malformations, 1974 - 1999 : Effect of Prenatal Diagnosis and Elective Termination. Obstetrics & Gynecology, 2004, 104(5) : 957 -964. 被引量：1
6Hobbs CA, Hopkins SE, Simmons CJ. Sources of variability in birth defects prevalence rates. Teratology, 2001,64 ( Suppl 1 ) : 8 - 13. 被引量：1
7International Clearinghouse for Birth Defects Monitoring Systems. Annual Report 2000. Rome: International Centre for Birth Defects, 2000. 被引量：1
8De Vigan C, Bacna N, Cariati E, et al. Contribution of ultrasonographic examination to the prenatal detection of chromosomal abnormalities in 19 centres across Europe. Annales de C, enetique, 2001, 44(4) : 209 -217. 被引量：1
9Siffel C, Correa A, Cragan J, et al. Prenatal diagnosis, pregnancy terminations and prevalence of Down syndrome in Atlanta. Birth Defects Research (Part A), 2004, 70:565 -571. 被引量：1
10Cragan JD, Khoury MJ. Effect of prenatal diagnosis on epidemiologic studies of birth defects. Epidemiology, 2000, 11 (6) : 695 - 699. 被引量：1
