Prospective versus retrospective approach in the search for environmental causes of malformations.
D000013:Congenital Abnormalities / Q000209:etiology*; D004358:Drug Therapy; D005260:Female; D005313:Fetal Death; D005387:Finland; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008568:Memory; D011247:Pregnancy; D011248:Pregnancy Complications; D011446:Prospective Studies; D012189:Retrospective Studies; D013997:Time Factors