title: [Threatened pregnancies and perinatal mortality during a 20-year period].
mesh_terms: D000029:Abortion, Legal / Q000009:adverse effects; D000328:Adult; D003267:Contraception / Q000009:adverse effects; D003604:Czechoslovakia; D005260:Female; D005313:Fetal Death / Q000453:epidemiology*; D006801:Humans; D007226:Infant Mortality; D008423:Maternal Age; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology*
vernacular_title: Rizikové tĕhotenství v perinatální úmrtnosti za 20 let.