title: [Causes of premature births].
mesh_terms: D000033:Abortion, Threatened / Q000150:complications; D000367:Age Factors; D005260:Female; D006801:Humans; D007752:Obstetric Labor, Premature / Q000453:epidemiology / Q000209:etiology*; D010923:Placenta Previa / Q000150:complications; D011044:Poland; D011247:Pregnancy; D012959:Socioeconomic Factors; D013997:Time Factors
vernacular_title: Przyczyny porodów przedwczesnych.