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Keyword
neural tube defects
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5
birth defects
3
folic acid
2
spina bifida
2
Hispanics
1
NTD
1
PGDM
1
Prevalence
1
alcohol
1
anencephaly
1
case-control study
1
china
1
diabetes
1
epidemiologic bias
1
epidemiology
1
level of lesion
1
misclassification
1
obesity
1
preconception
1
pregestational diabetes
1