1. UPMC Heart and Vascular Institute, University of Pittsburgh, PA (A.F.B., L.A., N.C.W., A.B., D.W., M.G., J.S., S.J., A.V., R.B., N.A.M.E., S.S., K.K.).
2. Department of Medicine, University of Pittsburgh Medical Center, PA (A.I., M.K.).
3. Cardiology Division, Pittsburgh VA Healthcare System, PA (A.A.S.).
4. University of Pittsburgh School of Medicine, Pittsburgh, PA (S.B.).