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Netherlands
Pregnancy
Neural Tube Defects
Down's Syndrome
Newborn Infant
Midwifery
Young Adult
Folic Acid
Preconception Care
Questionnaires
Health Knowledge, Attitudes, Practice
Cohort Studies
Prevalence
Registries
Risk Factors
Cross-Sectional Studies
Maternal Age
Educational Status
Logistic Models
Perinatal Mortality
Co-Publications
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