title: Case control study of neural tube defects and periconceptional vitamin use.
authors.affiliation: Slone Epidemiological Unit, Boston, Massachusetts.
authors.forename: A
authors.initials: A
authors.lastname: Mitchell
mesh_terms: D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D009436:Neural Tube Defects / Q000628:therapy*; D009749:Nutrition Surveys; D009751:Nutritional Requirements; D011247:Pregnancy; D011795:Surveys and Questionnaires; D014815:Vitamins / Q000627:therapeutic use*
chemical_list: D014815:Vitamins