1. From the Division of Cardiology and Duke Clinical Research Institute (C.M., M.T.R., A.Y.C., T.Y.W., E.D.P., K.P.A.), Duke University Medical Center, Durham, NC; Brigham and Women's Hospital (S.D.W.), Boston, Mass; and Section of Cardiology (P.M.H.), Denver VA Medical Center and University of Colorado Denver.