[Premature infants: structure, mortality and causes].
D002031:Bulgaria; D005260:Female; D005313:Fetal Death / Q000453:epidemiology / Q000209:etiology / Q000473:pathology; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007234:Infant, Premature; D007235:Infant, Premature, Diseases / Q000209:etiology / Q000473:pathology; D011247:Pregnancy
Nedonoseni detsa--struktura, smurtnost i prichina.