title: Case-control studies using only malformed infants who were prenatally exposed to drugs. What do the results mean?
authors.forename: L
authors.initials: L
authors.lastname: Prieto
authors.forename: M L
authors.initials: ML
authors.lastname: Martínez-Frías
mesh_terms: D000014:Abnormalities, Drug-Induced / Q000453:epidemiology / Q000209:etiology*; D016022:Case-Control Studies; D000013:Congenital Abnormalities / Q000453:epidemiology / Q000209:etiology; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008431:Maternal-Fetal Exchange; D016017:Odds Ratio; D011247:Pregnancy; D012307:Risk Factors; D013030:Spain / Q000453:epidemiology