1. Department of Medicine (Neurology) University of Alberta Edmonton Alberta Canada
2. Department of Neurology Washington University in St. Louis St. Louis Missouri USA
3. Department of Medicine Mayo Clinic Rochester Missouri USA
4. Faculty of Health Sciences, School of Public Health University of the Witwatersrand Parktown South Africa
5. Department of Radiology Washington University in St. Louis St. Louis Missouri USA
6. College of Medicine and Health University of Exeter Exeter United Kingdom
7. Department of Pathology and Immunology Washington University in St. Louis St. Louis Missouri USA
8. Departments of Neuroscience, Physical Therapy and Occupational Therapy Washington University in St. Louis St. Louis Missouri USA