1. Division of Cardiology, Department of Medicine (F.A., A.M., E.J.V., P.S.D., Z.S., S.R.), Duke University Medical Center, Durham, NC.
2. Duke Clinical Research Institute, Duke University Medical Center, Durham, NC (A.M., L.K.S., E.J.V., P.S.D.).
3. Department of Medicine (Z.J.I.), Duke University Medical Center, Durham, NC.
4. Department of Medicine, East Carolina University, Greenville, NC (I.S.).
5. Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA (V.F.T.).
6. Cardiac Diagnostic Unit, Division of Cardiology (K.A., D.R.)
7. Cardiology Center of the Medical School of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, São Paulo, Brazil (M.M.D.R.).