title: Trends in congenital malformations, 1974-1999: effect of prenatal diagnosis and elective termination.
authors.forename: Russell S
authors.initials: RS
authors.lastname: Kirby
mesh_terms: D000015:Abnormalities, Multiple / Q000453:epidemiology*; D000028:Abortion, Induced; D015986:Confounding Factors, Epidemiologic; D005260:Female; D006801:Humans; D008404:Massachusetts / Q000453:epidemiology; D011247:Pregnancy; D011296:Prenatal Diagnosis