No abstract available
MeSH terms
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Chorionic Gonadotropin / blood*
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Down Syndrome / diagnosis*
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Estriol / blood*
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Female
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Humans
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Parity*
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Pregnancy
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Pregnancy Trimester, Second
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Prenatal Diagnosis*
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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