1 Division of Cardiovascular Medicine, Department of Medicine, Hospital of the University of Pennsylvania, 2241 Sears Street, Philadelphia, PA, 19146.
2 Heart and Vascular Institute, Cleveland Clinic, Cleveland, OH.
3 Department of Biostatistics & Bioinformatics, Duke University School of Medicine, Durham, NC.
4 Department of Biostatistics & Bioinformatics, Duke University School of Medicine, Durham, NC; Division of Cardiology, Duke Clinical Research Institute, Duke University Medical Center, Durham, NC.
5 Division of Cardiology, Duke Clinical Research Institute, Duke University Medical Center, Durham, NC.