1 Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6S 0A9, Canada.
2 Department of Medicine, University of British Columbia, UBC Hospital S152, 2211 Wesbrook Mall, Vancouver, BC, V6T 2B5, Canada.
3 Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC, V6T 1Z1, Canada.
4 School of Professional Psychology, Pacific University, 190 SE 8th Avenue, Hillsboro, OR, 97123, USA.
5 Department of Radiology, University of British Columbia, 3350-950W 10th Avenue, Vancouver, BC, V5Z 1M9, Canada.
6 MS/MRI Research Group, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6S 0A9, Canada.
7 PET Group, Vancouver Hospital and Health Science Centre, Brain Research Centre, 2211 Westboork Mall, Vancouver, BC, V6T 2B5, Canada.
8 Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6S 0A9, Canada. teresa.ambrose@ubc.ca.
9 Department of Physical Therapy, University of British Columbia, 212-2177 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada. teresa.ambrose@ubc.ca.