Tactics from touch to transportation retain Medicare members.
D000368:Aged; D002140:California; D003120:Colorado; D003284:Contract Services / Q000458:organization & administration; D006279:Health Maintenance Organizations / Q000458:organization & administration / Q000706:statistics & numerical data*; D006297:Health Services Accessibility; D006299:Health Services for the Aged / Q000191:economics / Q000458:organization & administration; D006801:Humans; D006278:Medicare / Q000458:organization & administration*; D017060:Patient Satisfaction; D014186:Transportation; D014481:United States