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Keyword
- Anemia1
- Anti-epileptic drugs1
- Birth defects1
- Folic acid1
- Mandatory fortification1
- Neural tube defect1
- Prescriptions1
- REGARDS1
- Valproate1
- Valproic acid1
- anencephaly1
- epidemiologic bias1
- folic acid1
- misclassification1
- neural tube defects1
- obesity1
- prenatal diagnosis1
- selection bias1
- spina bifida1
- women of childbearing age1