1. Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
2. Department of Neurology and Division of Infectious Diseases, Anschutz Medical Campus, University of Colorado Neurosciences Center, Aurora, CO, USA
3. Departments of Immunology & Microbiology, Anschutz Medical Campus, University of Colorado, Aurora, CO, USA
4. Department of Radiology, University of Calgary, Calgary, AB, Canada
5. Department of Epidemiology, Colorado School of Public Health, Aurora, CO, USA