title: Ectopic pregnancies--United States, 1979-1980.
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000453:epidemiology*; D018566:Pregnancy, High-Risk; D014481:United States