title: HMOs' real competitive role.
mesh_terms: D004465:Economic Competition / Q000639:trends*; D004467:Economics / Q000639:trends*; D004469:Economics, Hospital / Q000639:trends*; D006279:Health Maintenance Organizations / Q000191:economics*; D006761:Hospitals / Q000706:statistics & numerical data; D008910:Minnesota; D014481:United States