1. Cardiovascular Medicine Division, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA (A.S.N., P.N.F., J.G.).
2. Cardiovascular Outcomes, Quality and Evaluative Research Center, University of Pennsylvania, Philadelphia, PA (A.S.N., J.G.).
3. Corporal Michael J. Crescenz VA Medical Center, Philadelphia, PA (A.S.N., P.N.F., J.G.).