1. Department of Medicine (Neurology), rm S159, 2211 Wesbrook Mall, University of British Columbia, Vancouver BC V6T 2B5, Canada, , Department of Health Care and Epidemiology, rm S159, 2211 Wesbrook Mall, University of British Columbia, Vancouver BC V6T 2B5, Canada
2. MS/MRI Research Group, rm S159, 2211 Wesbrook Mall, University of British Columbia, Vancouver BC V6T 2B5, Canada
3. Department of Medicine (Neurology), rm S159, 2211 Wesbrook Mall, University of British Columbia, Vancouver BC V6T 2B5, Canada