1. Division of Cardiology, University of British Columbia, Vancouver, British Columbia, Canada
2. Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina
3. Department of Radiology, Division of Cardiovascular Imaging and Cardiac MR PET CT Program, Massachusetts General Hospital, Harvard Medical School, Boston
4. Division of Cardiology, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey
5. The CardioVascular Center, Division of Cardiology, Tufts Medical Center, Boston, Massachusetts