1 Department of Medicine, Forrest General Hospital, Hattiesburg, MS.
2 Department of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR.
3 Division of Cardiology, Department of Medicine, Duke University, Durham, NC.
4 Division of Cardiology, Department of Medicine, Duke University, Durham, NC; Duke Clinical Research Institute, Durham, NC.
5 Division of Cardiology, Department of Medicine, Medical University of South Carolina, Charleston, SC.
6 Department of Cardiovascular Diseases, Mayo Clinic, Rochester, MN.
7 Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Chapel Hill, NC.
8 Division of Cardiology, Department of Medicine, Karolinska Institutet, Stockholm, Sweden.
9 Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD.
10 Division of Cardiology, Department of Medicine, Duke University, Durham, NC; Duke Clinical Research Institute, Durham, NC. Electronic address: [email protected].