DOI:
10.1055/s-00000009
American Journal of Perinatology
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References
Nicolaides KH, Wright D, Poon LC, Syngelaki A, Gil MM.
First-trimester contingent screening for trisomy 21 by biomarkers and maternal blood cell-free DNA testing.
Ultrasound Obstet Gynecol 2013;
42 (1) 41-50
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