title: 1997 saw HMO membership up, hospital days down.
mesh_terms: D016527:Drug Costs; D005249:Fees and Charges; D006279:Health Maintenance Organizations / Q000191:economics* / Q000458:organization & administration / Q000706:statistics & numerical data*; D006801:Humans; D007902:Length of Stay; D008484:Medicaid; D006278:Medicare; D014481:United States