Case-control study of vitamin supplementation and neural tube defects. Consideration of potential confounding by lifestyle factors.
Slone Epidemiology Unit, Boston University School of Public Health, Brookline, Massachusetts 02146.
M M
MM
Werler
A A
AA
Mitchell
D000328:Adult; D016022:Case-Control Studies; D003710:Demography; D005260:Female; D006304:Health Status; D006801:Humans; D008019:Life Style; D009436:Neural Tube Defects / Q000453:epidemiology*; D011247:Pregnancy; D014815:Vitamins / Q000008:administration & dosage / Q000627:therapeutic use*
D014815:Vitamins