No abstract available
MeSH terms
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Amniotic Fluid / chemistry*
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Biomarkers / blood*
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Female
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Genetic Testing / methods
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Genetic Testing / standards*
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Humans
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Neural Tube Defects / genetics*
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Patient Education as Topic / standards
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Pregnancy
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Pregnancy Trimester, Second / blood
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Prenatal Diagnosis / methods
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Prenatal Diagnosis / standards*
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Reproducibility of Results
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Research Design / standards*
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Specimen Handling / standards