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First-trimester screening for trisomies 21, 18 and 13 by ultrasound and biochemical testing.
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Fetal Diagn Ther 2014;35:118-26. pdf -
Maternal serum concentrations of pregnancy associated plasma protein A and pregnancy specific B-1 glycoprotein in multifetal pregnancies before and after fetal reduction.
Abbas A, Sebire NJ, Johnson M, Bersinger N, Nicolaides KH.
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