No abstract available
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Amniocentesis*
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Congenital Abnormalities / diagnosis
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Female
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Genetics, Medical*
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Humans
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Male
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Pedigree
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Pregnancy
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Sex Factors
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Statistics as Topic
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Twins*
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Twins, Monozygotic*
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Ultrasonography