aDepartment of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada

bHyperfine, Inc., Guilford, Connecticut, USA

cDepartment of Medicine (Neurology)

dDepartment of Radiology

eInternational Collaboration on Repair Discoveries, Blusson Spinal Cord Centre, University of British Columbia, Vancouver, British Columbia, Canada

Correspondence to Shannon H. Kolind, PhD, University of British Columbia, S199-2211 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada. Tel: +1 604 822 7773; e-mail: [email protected]