No abstract available
Publication types
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Multicenter Study
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Research Support, American Recovery and Reinvestment Act
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Research Support, N.I.H., Intramural
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Twin Study
MeSH terms
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Adolescent
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Adult
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Cohort Studies
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Female
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Fetal Development / physiology*
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Gestational Age
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Humans
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Maternal Age
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Pregnancy
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Quality Assurance, Health Care / standards
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Racial Groups / ethnology
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Twins*
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Ultrasonography, Prenatal
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Young Adult