No abstract available
MeSH terms
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Chorionic Gonadotropin*
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Down Syndrome / genetics*
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Female
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Genetic Markers
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Genetic Testing
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Health Maintenance Organizations / legislation & jurisprudence*
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Humans
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Jurisprudence
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Patents as Topic / legislation & jurisprudence*
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Pregnancy
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Prenatal Diagnosis / methods*
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United States
Substances
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Chorionic Gonadotropin
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Genetic Markers