title: [Basic trends in perinatal mortality in the country and the factors influencing its level].
mesh_terms: D000328:Adult; D001724:Birth Weight; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007234:Infant, Premature; D008423:Maternal Age; D011247:Pregnancy; D012306:Risk; D012424:Rural Population; D012426:Russia
vernacular_title: Osnovnye tendentsii perinatal'noĭ smertnosti na sele i faktory, vliiaiushchie na ee uroven'.