No abstract available
MeSH terms
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Anthropometry
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Chromosome Aberrations / diagnostic imaging*
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Chromosome Disorders
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Chromosomes, Human, Pair 13*
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Chromosomes, Human, Pair 18*
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Down Syndrome / diagnostic imaging*
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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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Risk Factors
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Trisomy*
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Ultrasonography, Prenatal*