1. Cardiovascular Division (T.M.M., G.S.G., M.C.H., J.S.A., P.S., R.D.S., G.E.S., R.D., S.N., S.D., D.J.C., A.E.E., F.E.M., D.S.F.), Perelman School of Medicine at the University of Pennsylvania, Philadelphia.
2. Division of Cardiovascular Surgery (C.R.B.), Perelman School of Medicine at the University of Pennsylvania, Philadelphia.
3. Center for Cardiovascular Outcomes, Quality, and Evaluative Research, University of Pennsylvania, Philadelphia (L.Y., P.W.G., D.S.F.).
4. Corporal Michael J. Crescenz VA Medical Center, Philadelphia (R.D., S.D., A.E.E., P.W.G.).
5. Division of General Internal Medicine (P.W.G.), Perelman School of Medicine at the University of Pennsylvania, Philadelphia.