PREMATURITY.
D044383:Black People; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D007234:Infant, Premature; D012924:Social Conditions; D014481:United States; D044465:White People; D001741:Black or African American
CAUCASIAN RACE; INFANT MORTALITY; INFANT, PREMATURE; NEGROES; SOCIAL CONDITIONS; UNITED STATES