title: Periconceptional use of multivitamins and the prevalence of neural-tube defects.
mesh_terms: D005260:Female; D005315:Fetal Diseases / Q000139:chemically induced*; D006801:Humans; D009436:Neural Tube Defects / Q000139:chemically induced*; D011247:Pregnancy; D014815:Vitamins / Q000009:adverse effects*
chemical_list: D014815:Vitamins