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Down Syndrome - Comparison of Screening Methods in the 1st and 2nd Trimesters
down syndrome, chromosome abnormalities, pregnancy, ultrasound, serum screen, pregnancy associated plasma protein-a (papp-a), free-beta human chorionic gonadotropin (fbhcg), alpha fetoprotein, unconjugated estriol, inhibin-a, aneuploidy, interventional
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