1. Division of Cardiovascular Medicine, Hospital of the University of Pennsylvania, Philadelphia (M.C.H., H.C.H., S.A., T.K., J.G.);
2. Cardiovascular Quality, Outcomes, and Evaluative Research Center, Perelman School of Medicine, University of Pennsylvania, Philadelphia (M.C.H., P.A.P., T.K., N.D.D., F.H.M., J.G.);
3. Duke Clinical Research Institute, Durham, NC (S.V., A.S., R.A.M.);
4. Division of Cardiovascular Surgery, Hospital of the University of Pennsylvania, Philadelphia (W.Y.S., P.V., F.H.M., J.E.B.);
5. Department of Anesthesiology and Critical Care, Hospital of the University of Pennsylvania, Philadelphia (P.A.P.);
6. Division of Cardiovascular Medicine, Penn Presbyterian Medical Center, Philadelphia (R.L.).