Perspectives. Medicare, insurers, big employers begin to eye practice variations.
D000368:Aged; D006264:Health Benefit Plans, Employee / Q000706:statistics & numerical data*; D006801:Humans; D006278:Medicare / Q000706:statistics & numerical data*; D011057:Politics; D010818:Practice Patterns, Physicians' / Q000191:economics*; D014481:United States