1 From the Department of Medicine, Brigham and Women's Hospital (S.G.), and the Section of Health Policy and Equity, Richard A. and Susan F. Smith Center for Outcomes Research, Beth Israel Deaconess Medical Center (S.G., R.K.W.) - both in Boston; and the Cardiovascular Division, John T. Milliken Department of Medicine, Washington University School of Medicine in St. Louis, and the Center for Health Economics and Policy, Washington University in St. Louis - both in St. Louis (K.J.M.).