1 Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical Center, Durham, North Carolina.
2 Division of Cardiology, Duke University, Durham, North Carolina, and Associate Editor, JAMA.
3 Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical Center, Durham, North Carolina3Division of General Internal Medicine, Department of Medicine, Duke University, Durham, North Carolina4Department of Psychiatry and Behavioral Sciences and School of Nursing, Duke University, Durham, North Carolina.