Infant mortality rates are proxies for use of neonatal intensive care units in hospitals.
D005006:Ethnicity / Q000706:statistics & numerical data; D006801:Humans; D007226:Infant Mortality / Q000639:trends*; D007231:Infant, Newborn; D007363:Intensive Care Units, Neonatal / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology