title: [STUDIES ON THE FREQUENCY OF STERILITY IN BULGARIA].
mesh_terms: D001699:Biometry; D002031:Bulgaria; D005260:Female; D006801:Humans; D007246:Infertility; D007247:Infertility, Female; D013223:Statistics as Topic
keywords: BULGARIA; STATISTICS; STERILITY, FEMALE
vernacular_title: PROUCHVANIIA VURKHU CHESTOTATA NA STERILITETA U NAS.