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Keyword
neural tube defects
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4
birth defects
2
folic acid
2
Hispanics
1
NTD
1
PGDM
1
Prevalence
1
china
1
diabetes
1
epidemiologic bias
1
level of lesion
1
misclassification
1
obesity
1
preconception
1
pregestational diabetes
1
prenatal diagnosis
1
reproductive age women
1
selection bias
1
spina bifida
1