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Pregnancy
Genotype
Case Control Studies
Population Surveillance
Newborn Infant
Infants
Folic Acid
Methylenetetrahydrofolate Reductase (NADPH2)
Congenital Heart Defects
Down's Syndrome
Neural Tube Defects
United States
Arkansas
Risk Factors
Odds Ratio
Prevalence
Registries
Dietary Supplements
Life Style
Single Nucleotide Polymorphism
Co-Publications
36
12
11
9
8
7
6
5
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