Affiliation: | a Center for Health Services Research in Primary Care, Durham VAMC, Durham, NC b Division of General Internal Medicine, Department of Medicine, Duke University, Durham, NC c Department of Biostatistics and Bioinformatics, Duke University, Durham, NC d Department of Medicine, VA Palo Alto Health Care System and Center for Primary Care and Outcomes Research, Stanford University, Palo Alto, CA e VA Boston Health Care System and Harvard Medical School, Boston, MA |