Equity and the utilization of health care services by the Medicare elderly.
D001741:Black or African American; D000368:Aged; D006299:Health Services for the Aged / Q000706:statistics & numerical data*; D006801:Humans; D007182:Income; D007902:Length of Stay; D006278:Medicare / Q000706:statistics & numerical data*; D014481:United States; D044465:White People