No abstract available
MeSH terms
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Adult
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Age Factors
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Body Weight
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Chorionic Gonadotropin / analysis
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Down Syndrome / blood
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Down Syndrome / prevention & control*
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Family
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Female
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Humans
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Prenatal Diagnosis / methods
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Prenatal Diagnosis / standards
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Risk Factors
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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