The effect of prescription drug insurance on utilization and health among the elderly.
D000368:Aged; D004363:Drug Utilization; D006296:Health Services / Q000706:statistics & numerical data*; D006304:Health Status; D006760:Hospitalization; D006801:Humans; D019458:Insurance Coverage; D007356:Insurance, Pharmaceutical Services; D006278:Medicare; D014481:United States