Looking back to understand future trends.
D006264:Health Benefit Plans, Employee / Q000191:economics / Q000639:trends*; D017048:Health Care Costs / Q000639:trends; D019538:Health Care Surveys; D005102:Health Expenditures / Q000639:trends; D006801:Humans; D008329:Managed Care Programs / Q000191:economics / Q000706:statistics & numerical data*; D014481:United States