Enrollees switching Medicare HMOs fast.
Weissenstein
E
E
D000368:Aged; D003258:Consumer Behavior / Q000706:statistics & numerical data*; D003625:Data Collection; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data*; D006801:Humans; D006278:Medicare / Q000706:statistics & numerical data*; D014481:United States