1. Division of Cardiology (A.C.F., M.T.R., T.Y.W., E.D.P., S.V.R.), Duke University, Durham, NC.
2. Duke Clinical Research Institute (A.C.F., P.Z., D.W., L.A.K., M.W.S., M.T.R., T.Y.W., E.D.P., S.V.R.), Duke University, Durham, NC.
3. Division of Cardiology, Inova Heart and Vascular Institute, Falls Church, VA (M.W.S.).
4. Division of Cardiology, University of Michigan, Ann Arbor (H.S.G.).
5. Division of Cardiology, University of Miami, FL (M.G.C.).
6. Division of Cardiology, University of Colorado, Aurora (J.C.M.).