No abstract available
MeSH terms
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Chromosome Disorders / diagnosis*
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Chromosomes, Human, Pair 13
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Chromosomes, Human, Pair 18
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DNA / blood*
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Down Syndrome / diagnosis*
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Female
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Humans
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Mothers*
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Pregnancy
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Prenatal Diagnosis*
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Trisomy / diagnosis*
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Trisomy 13 Syndrome
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Trisomy 18 Syndrome