No abstract available
MeSH terms
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Adult
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Chromosome Aberrations*
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Chromosome Disorders / diagnostic imaging*
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Chromosome Disorders / prevention & control
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Clinical Trials as Topic
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Female
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Fetal Diseases / diagnosis
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Fetal Diseases / diagnostic imaging*
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Humans
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Image Enhancement / methods*
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Mass Screening / methods*
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Middle Aged
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Neck / diagnostic imaging*
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Neck / embryology
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Predictive Value of Tests
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Pregnancy
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Pregnancy Trimester, First*
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Sensitivity and Specificity
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Ultrasonography, Prenatal / methods*