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