Medicare: new choices, new worries.
D000367:Age Factors; D000368:Aged; D002017:Budgets; D003365:Costs and Cost Analysis; D005544:Forecasting; D018166:Health Care Reform; D006279:Health Maintenance Organizations / Q000331:legislation & jurisprudence / Q000639:trends; D006801:Humans; D019458:Insurance Coverage; D007356:Insurance, Pharmaceutical Services; D006278:Medicare / Q000331:legislation & jurisprudence / Q000639:trends; D014481:United States