title: Widening gaps in the wall obscuring physician performance differences.
authors.affiliation: Stanford's Clinical Excellence Research Center, Stanford University, Stanford, California2Pacific Business Group on Health, San Francisco, California.
authors.forename: Arnold
authors.initials: A
authors.lastname: Milstein
authors.affiliation: Venrock Partners, Menlo Park, California.
authors.forename: Robert
authors.initials: R
authors.lastname: Kocher
mesh_terms: D008484:Medicaid / Q000592:standards*; D006278:Medicare / Q000592:standards*; D010818:Practice Patterns, Physicians'; D011364:Professional Practice; D011787:Quality of Health Care; D014481:United States