title: [Etiology of sterility: frequency, causes, etiology and the clinical picture in Bulgaria].
mesh_terms: D002031:Bulgaria; D005260:Female; D005831:Genital Diseases, Female / Q000150:complications; D006801:Humans; D007247:Infertility, Female / Q000453:epidemiology / Q000209:etiology*; D007248:Infertility, Male / Q000453:epidemiology / Q000209:etiology*; D008297:Male; D011247:Pregnancy; D012959:Socioeconomic Factors
vernacular_title: Etiologiia na bezplodieto--chestota, prichini, etiologiia i klinika v Bulgariia.