No abstract available
MeSH terms
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Congenital Abnormalities / epidemiology
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Congenital Abnormalities / prevention & control
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Female
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Folic Acid / administration & dosage
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Folic Acid / blood
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Folic Acid / pharmacology*
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Food, Fortified
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Humans
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Incidence
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Pregnancy
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United States / epidemiology
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United States Food and Drug Administration
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Vitamin B 12 / administration & dosage
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Vitamin B 12 / blood
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Vitamin B 12 / pharmacology*
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Vitamin B 12 Deficiency / epidemiology
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Vitamin B 12 Deficiency / prevention & control