1. Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, PA (E.J.D.).
2. Center for Cardiovascular Outcomes, Quality, and Evaluative Research, and the Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia (E.J.D.).
3. Center for Outcomes Research and Evaluation, Yale-New Haven Health System, CT (J.S.R.).
4. Section of General Internal Medicine, Department of Internal Medicine, Yale School of Medicine, New Haven, CT (J.S.R.).
5. Department of Health Policy and Management, Yale School of Public Health, New Haven, CT (J.S.R.).
6. Division of Health Care Policy and Research and Robert D. and Patricia E. Kern Center for the Science of Health Care Delivery, Mayo Clinic, Rochester, MN (N.D.S.).
7. San Francisco Veterans Affairs Medical Center, CA (S.S.D.).
8. Division of Cardiology, Department of Medicine, University of California, San Francisco School of Medicine (S.S.D.).