BarkaiGGoldmanBRiesLChakiRZerTCuckleH.Expanding multiple marker screening for Down's syndrome to include Edward's syndrome. Prenat Diagn1993;13:843–50.
2.
PalomakiGEHaddowJEKnightGJRisk-based prenatal screening for Trisomy 18 using alpha-fetoprotein, unconjugated estriol and human chorionic gonadotropin. Prenat Diagn1995;15:713–23.
3.
SpencerKMallardASCoombesEJMacriJN. Prenatal screening for trisomy 18 with free β-hCG as a marker. BMJ1993;307:1455–8.
4.
WaldNJDensemJWSmithDKleeGG. Four marker serum screening for Down's syndrome. Prenat Diagn1994; 14:707–16.
5.
HookEBCrossPKSchreinemachersDM. Chromosomal abnormality rates at amniocentesis and in live bom infants. JAMA1983;249:2034–8.
6.
TaborAMadsenMObelEBPhilipJBangJNorgaard-PedersenB.Randomised controlled trial of generic amniocentesis in 4606 low-risk women. Lancet1986;i:1287–93.
7.
DonnenfeldAE. Prenatal sonographic detection of isolated fetal choroid plexus cysts: Should we screen for trisomy 18?Journal of Medical Screening1955;2:18–21.