No abstract available
MeSH terms
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Adult
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Case-Control Studies
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Causality
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China / epidemiology
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Demography
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Environmental Exposure / adverse effects*
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Female
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Folic Acid / administration & dosage*
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Folic Acid Deficiency* / epidemiology
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Folic Acid Deficiency* / prevention & control
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Heart Defects, Congenital / classification
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Heart Defects, Congenital / epidemiology*
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Heart Defects, Congenital / therapy
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Humans
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Infant, Newborn
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Male
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Pregnancy
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Pregnancy Complications* / diagnosis
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Pregnancy Complications* / epidemiology
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Risk Assessment
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Risk Factors
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Socioeconomic Factors
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Vitamin B Complex / administration & dosage
Substances
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Vitamin B Complex
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Folic Acid