Medicare/Medicaid ... senior citizens are often viewed as resistant to managed care.
D000368:Aged; D001294:Attitude to Health; D003256:Community Participation; D003625:Data Collection; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data*; D006801:Humans; D006278:Medicare / Q000458:organization & administration / Q000706:statistics & numerical data*; D014481:United States