title: A comparison of plan characteristics between all HMOs and HMOs with TEFRA risk contracts.
mesh_terms: D000368:Aged; D003284:Contract Services; D003625:Data Collection; D006279:Health Maintenance Organizations / Q000458:organization & administration*; D006801:Humans; D006278:Medicare; D012306:Risk; D013659:Tax Equity and Fiscal Responsibility Act; D014481:United States