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- Periconceptual vitamin use among Mexican
American case women with neural tube defect-affected pregnancies and control women in 14
Texas-Mexico border counties, 1995-1999 - Vitamin use was defined as maternal use of multivitamins, prenatal vitamins, or single ingredient folic acid tablets from 3 months before conception to 3 months after conception - Only 11 case and 10 control women reported daily use of folic acid-containing vitamins throughout the entire preconception period |