By the numbers. A popular choice for Medicare beneficiaries.
Stanton
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D000368:Aged; D005102:Health Expenditures / Q000706:statistics & numerical data; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data*; D006801:Humans; D006278:Medicare / Q000706:statistics & numerical data*; D017060:Patient Satisfaction; D014481:United States