Enrollment, access woes cited at some Medicare risk HMOs.
Kertesz
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D000368:Aged; D003258:Consumer Behavior / Q000706:statistics & numerical data; D006279:Health Maintenance Organizations / Q000592:standards* / Q000706:statistics & numerical data; D006297:Health Services Accessibility / Q000706:statistics & numerical data*; D006304:Health Status; D006801:Humans; D015273:Insurance Selection Bias; D006278:Medicare / Q000592:standards*; D014481:United States