Questioning the quality of health services.
D005069:Evaluation Studies as Topic; D006123:Group Practice / Q000592:standards*; D006125:Group Practice, Prepaid / Q000592:standards*; D006279:Health Maintenance Organizations / Q000592:standards*; D006278:Medicare / Q000331:legislation & jurisprudence*; D011785:Quality Assurance, Health Care / Q000331:legislation & jurisprudence*; D012306:Risk; D014481:United States