title: Medicare turns to HMOs.
mesh_terms: D004465:Economic Competition; D006279:Health Maintenance Organizations / Q000331:legislation & jurisprudence*; D006291:Health Policy / Q000331:legislation & jurisprudence*; D008389:Marketing of Health Services; D006278:Medicare / Q000191:economics / Q000331:legislation & jurisprudence*; D014481:United States