The challenge of neonatal mortality in an urban hospital.
D001723:Birth Rate; D001724:Birth Weight; D005006:Ethnicity; D006784:Hospitals, Teaching; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D010414:Pennsylvania; D012923:Social Class; D012959:Socioeconomic Factors; D013548:Sweden; D014481:United States; D014505:Urban Population