No abstract available
MeSH terms
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Biomarkers / blood
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Chorionic Gonadotropin, beta Subunit, Human / blood*
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Database Management Systems
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Down Syndrome / blood*
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Down Syndrome / diagnosis
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False Negative Reactions
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False Positive Reactions
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Female
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Gestational Age*
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Humans
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Netherlands
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Pregnancy
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Pregnancy Trimester, First
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Pregnancy-Associated Plasma Protein-A / analysis*
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Prenatal Diagnosis / methods*
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Retrospective Studies
Substances
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Biomarkers
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Chorionic Gonadotropin, beta Subunit, Human
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Pregnancy-Associated Plasma Protein-A