Infant mortality: relationship between neonatal and postneonatal mortality during a period of increasing perinatal center utilization.
D000367:Age Factors; D000407:Alabama; D001724:Birth Weight; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007363:Intensive Care Units, Neonatal / Q000706:statistics & numerical data*; D012306:Risk