No abstract available
Publication types
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Letter
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Multicenter Study
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Observational Study
MeSH terms
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Adult
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Biomarkers / blood
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Cell-Free Nucleic Acids / blood*
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Down Syndrome / diagnosis*
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Female
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Humans
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Pregnancy
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Pregnancy Trimester, First
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Pregnancy, Twin*
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Prenatal Diagnosis*
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Retrospective Studies
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Sensitivity and Specificity
Substances
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Biomarkers
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Cell-Free Nucleic Acids