No abstract available
MeSH terms
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Chromosome Disorders / diagnostic imaging
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Female
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Fetal Diseases / diagnostic imaging*
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Fetus / anatomy & histology*
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Gestational Age
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Humans
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Pregnancy Trimester, First*
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Pregnancy*
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Prenatal Care / methods
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Time Factors
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Ultrasonography, Prenatal / instrumentation
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Ultrasonography, Prenatal / methods*