1 Department of Medicine, Duke University School of Medicine, Durham, NC.
2 Lincoln Medical Center, New York, NY.
3 Forrest General Hospital, Hattiesburg, MS.
4 Baylor Scott and White Research Institute, Dallas, TX; Department of Medicine, University of Mississippi, Jackson, MS.
5 Divison of Cardiology, Duke University School of Medicine, Durham, NC; Duke Clinical Research Institute, Durham, NC.
6 Divison of Cardiology, Duke University School of Medicine, Durham, NC; Duke Clinical Research Institute, Durham, NC. Electronic address: [email protected].