1. From Duke University Medical Center (L.A.S.), Division of Nephrology, Durham, NC; Mayo Clinic (P.J.B., P.B.B., B.J.G., H.H.T., D.H.), Division of Cardiology, Minneapolis, Minn; University of Pittsburgh (E.C., M.M.B., K.M.D.), Division of Cardiology, Pittsburgh, Pa; University of Alabama (V.B.), Division of Cardiology, Birmingham, Ala; Duke Clinical Research Institute (R.J., R.M.C.), Duke University Medical Center, Durham, NC; and Cleveland Clinic (P.J.W.), Division of Cardiology, Cleveland, Ohio.