No abstract available
MeSH terms
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Adult
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Amniotic Fluid / chemistry
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Blood Chemical Analysis
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Down Syndrome / diagnosis*
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Down Syndrome / epidemiology
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Female
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Gestational Age
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Humans
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Maternal Age
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Neural Tube Defects / diagnosis*
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Neural Tube Defects / epidemiology
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Pregnancy
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Prenatal Diagnosis*
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Risk Factors
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alpha-Fetoproteins / analysis