No abstract available
MeSH terms
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Amniotic Fluid / diagnostic imaging
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Chromosome Aberrations / embryology
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Female
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Fetal Diseases / diagnostic imaging
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Fetal Growth Retardation / diagnostic imaging
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Gestational Age
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Humans
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Obstetrics / methods*
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Pregnancy
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Pregnancy, Twin
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Sensitivity and Specificity
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Ultrasonography, Prenatal* / adverse effects
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Ultrasonography, Prenatal* / methods
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United States