Letter: Causation of malformations.
D000015:Abnormalities, Multiple / Q000209:etiology* / Q000235:genetics; D000022:Abortion, Spontaneous / Q000453:epidemiology; D000013:Congenital Abnormalities / Q000453:epidemiology / Q000209:etiology* / Q000235:genetics; D005260:Female; D006801:Humans; D011247:Pregnancy