No abstract available
MeSH terms
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Adolescent
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Adult
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Biomarkers / blood
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Chorionic Gonadotropin / blood
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Diagnostic Errors
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Down Syndrome / blood
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Down Syndrome / diagnosis
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Down Syndrome / prevention & control*
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Estriol / blood
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Female
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Humans
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Mass Screening
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Maternal-Fetal Exchange
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Pregnancy
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Prenatal Diagnosis
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Prospective Studies
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alpha-Fetoproteins / analysis
Substances
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Biomarkers
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Chorionic Gonadotropin
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alpha-Fetoproteins
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Estriol