Flawed epidemiology of birth defects?
D000013:Congenital Abnormalities / Q000145:classification* / Q000453:epidemiology; D004812:Epidemiologic Methods; D005260:Female; D005492:Folic Acid / Q000008:administration & dosage; D006801:Humans; D007231:Infant, Newborn; D010641:Phenotype; D011247:Pregnancy
D005492:Folic Acid