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First-trimester screening for trisomies 21, 18 and 13 by ultrasound and biochemical testing.
Wright D, Syngelaki A, Bradbury I, Akolekar R, Nicolaides KH.
Fetal Diagn Ther 2014;35:118-26. pdf -
Fetal hepatic alpha-fetoprotein mRNA expression in fetuses with trisomy 21 and 18 at 12-15 weeks gestation.
Brizot ML, Mckie AT, von-Kaisenberg CS, Farzaneh F, Nicolaides KH.
Early Hum Dev 1996;44:155-9.