HMOs, providers using team sell.
Jaklevic
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D000368:Aged; D002641:Chicago; D006279:Health Maintenance Organizations / Q000458:organization & administration* / Q000706:statistics & numerical data; D006739:Hospital Administration; D006801:Humans; D007373:Interinstitutional Relations; D008389:Marketing of Health Services / Q000379:methods*; D006278:Medicare; D014481:United States