Factors influencing progress towards viability of federally funded HMOs. A national study.
D005380:Financing, Government / Q000639:trends*; D006275:Health Facility Planning / Q000191:economics*; D006279:Health Maintenance Organizations / Q000458:organization & administration*; D006291:Health Policy; D011446:Prospective Studies; D012044:Regression Analysis; D014481:United States