Affiliation: | 1.VA National Quality Scholars Fellowship,Tennessee Valley Healthcare System,Nashville,USA;2.Division of General Internal Medicine, Department of Medicine,University of Texas Southwestern Medical Center,Dallas,USA;3.Division of Outcomes and Health Services Research, Department of Clinical Sciences,University of Texas Southwestern Medical Center,Dallas,USA;4.Department of Epidemiology and Biostatistics,Case Western Reserve University,Cleveland,USA |