1 University of Alberta, Faculty of Rehabilitation Medicine, Dept. of Physical Therapy, Edmonton, Alberta T6G 2G4, Canada.
2 University of California, Dept. of Neurological Surgery, Brain and Spinal Injury Center, 2540 23rd Street, Floor 3, Workstation 3723, San Francisco, CA 94110, USA.
3 University of California, Brain and Spinal Injury Center, 1001 Potrero Avenue, Bldg. 1, Rm 101, San Francisco, CA 94110, USA.
4 University of Alberta, Faculty of Rehabilitation Medicine, Dept. of Physical Therapy, Edmonton, Alberta T6G 2G4, Canada. Electronic address: karim.fouad@ualberta.ca.