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United States
Population Surveillance
Prenatal Care
Assisted Reproductive Techniques
Neonatal Screening
Newborn Infant
Dizygotic Twins
Pregnancy
Pregnancy, Multiple
Prevalence
Cohort Studies
Selection Biases
Risk Factors
Monte Carlo Method
Infant Mortality
Folic Acid
Dietary Supplements
Fortified Food
Child Development Disorders, Pervasive
Neural Tube Defects
Co-Publications
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