No abstract available
Publication types
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Comment
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Comparative Study
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Letter
MeSH terms
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Adult
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Chorionic Gonadotropin / blood
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Down Syndrome / diagnosis*
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Down Syndrome / epidemiology
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Down Syndrome / genetics
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Estriol / blood
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Female
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Humans
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Karyotyping
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Mass Screening
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Maternal Age
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Middle Aged
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Pregnancy
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Pregnancy, High-Risk
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Risk Factors
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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