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Maternal Serum Screening for Fetal Down Syndrome in Women Less Than 35 Years of Age Using Alpha-Fetoprotein, hCG, and Unconjugated Estriol: A Prospective 2-Year Study

Maternal Serum Screening for Fetal Down Syndrome in Women Less Than 35 Years of Age Using Alpha-Fetoprotein, hCG, and Unconjugated Estriol: A Prospective 2-Year Study — Distribution of the number of citations over years.

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