No abstract available
MeSH terms
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Educational Status
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Female
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Humans
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Marital Status / statistics & numerical data
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Maternal Age
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Pregnancy
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Pregnancy Complications / epidemiology
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Pregnancy, Multiple / ethnology
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Pregnancy, Multiple / statistics & numerical data*
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Racial Groups / statistics & numerical data
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Reproductive Behavior / statistics & numerical data
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Reproductive Techniques, Assisted / statistics & numerical data
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Reproductive Techniques, Assisted / trends
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United States / epidemiology