title: Higher rate of multiple births after periconceptional vitamin supplementation.
authors.forename: A E
authors.initials: AE
authors.lastname: Czeizel
authors.forename: J
authors.initials: J
authors.lastname: Métneki
authors.forename: I
authors.initials: I
authors.lastname: Dudás
mesh_terms: D001723:Birth Rate; D005260:Female; D006801:Humans; D006814:Hungary; D011247:Pregnancy; D011256:Pregnancy Outcome; D011272:Pregnancy, Multiple; D014815:Vitamins / Q000008:administration & dosage*
chemical_list: D014815:Vitamins