No abstract available
MeSH terms
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Chromosomes, Human, Pair 13*
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Chromosomes, Human, Pair 18*
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Down Syndrome / diagnosis*
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Humans
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In Situ Hybridization, Fluorescence*
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Polymerase Chain Reaction
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Prenatal Diagnosis*
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Sex Chromosome Disorders / diagnosis*
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Trisomy / diagnosis*
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Ultrasonography, Prenatal