HMO growth trends.
D000368:Aged; D003625:Data Collection; D006264:Health Benefit Plans, Employee / Q000706:statistics & numerical data* / Q000639:trends; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data* / Q000639:trends; D006801:Humans; D019458:Insurance Coverage / Q000706:statistics & numerical data; D006278:Medicare / Q000706:statistics & numerical data; D014481:United States