Health care for Medicare beneficiaries: the HMO option.
D000368:Aged; D003362:Cost-Benefit Analysis; D005260:Female; D006279:Health Maintenance Organizations / Q000191:economics*; D006801:Humans; D007342:Insurance Benefits; D008297:Male; D006278:Medicare / Q000191:economics*; D011787:Quality of Health Care; D014481:United States