No abstract available
MeSH terms
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Chorionic Gonadotropin / blood*
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Down Syndrome* / diagnosis*
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Enzyme-Linked Immunosorbent Assay / economics
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Estriol / blood*
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Female
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Humans
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Pregnancy / blood*
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Pregnancy Trimester, Second
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Sensitivity and Specificity
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alpha-Fetoproteins / analysis*
Substances
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Chorionic Gonadotropin
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alpha-Fetoproteins
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Estriol