1. Department of Medicine, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
2. Division of Cardiology, King Abdulaziz University Hospital, King Abdulaziz University, Jeddah, Saudi Arabia
3. Department of Neurology, Duke University Medical Center, Durham, North Carolina
4. Neuroscience Medicine, Duke Clinical Research Institute, Durham, North Carolina
5. Neurodiagnostic Center, Veterans Affairs Medical Center, Durham, North Carolina
6. Division of General Internal Medicine, Duke Veterans Affairs Medical Center, Durham, North Carolina
7. Duke University, Durham, North Carolina