No abstract available
MeSH terms
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Adult
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Chorionic Gonadotropin / blood
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Down Syndrome / blood*
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Down Syndrome / prevention & control
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Estradiol / blood
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Female
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Health Services Research
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Humans
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Mass Screening / methods*
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Maternal Age
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United Kingdom
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alpha-Fetoproteins / chemistry
Substances
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Chorionic Gonadotropin
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alpha-Fetoproteins
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Estradiol