title: [Fate of twins in the perinatal period].
mesh_terms: D001724:Birth Weight; D002031:Bulgaria; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007234:Infant, Premature; D011247:Pregnancy; D014427:Twins
vernacular_title: Sŭdbata na bliznatsite v perinatalniia period.