No abstract available
MeSH terms
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Birth Weight
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Embryonic and Fetal Development
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Epidemiologic Studies
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Exercise*
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Female
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Fetal Growth Retardation / epidemiology*
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Fetal Growth Retardation / etiology
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Humans
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Infant, Newborn
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Obstetric Labor, Premature / epidemiology*
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Obstetric Labor, Premature / etiology
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Pregnancy
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United States / epidemiology