No abstract available
Publication types
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Editorial
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Historical Article
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Review
MeSH terms
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Amniocentesis / history
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Down Syndrome / diagnostic imaging*
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Down Syndrome / genetics
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Echocardiography / history
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Echocardiography / methods*
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Female
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Heart Defects, Congenital / diagnostic imaging*
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History, 20th Century
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Humans
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Pregnancy
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Pregnancy Trimester, Second
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Ultrasonography, Prenatal / history
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Ultrasonography, Prenatal / methods*
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alpha-Fetoproteins / analysis