1. Division of Cardiovascular Medicine, Department of Internal Medicine (M.C.K., J.J.L., R.L.W., M.G., S.L.H., J.R.C., K.D.A., M.M.C., T.M.K., V.L.M.)
2. University of Michigan, Ann Arbor. Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Boston (R.V.S.).
3. Division of Nuclear Medicine, Department of Radiology (J.R.C., E.P.F., V.L.M.)