Medicaid payments and utilization of medical services by the poor.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D003365:Costs and Cost Analysis; D006296:Health Services / Q000706:statistics & numerical data*; D006801:Humans; D007182:Income; D008484:Medicaid / Q000706:statistics & numerical data*; D008875:Middle Aged; D011203:Poverty; D011632:Public Assistance; D014481:United States