1. Defense and Veterans Brain Injury Center, Walter Reed National Military Medical Center, Bethesda, Maryland, USA.
2. National Intrepid Center of Excellence, Walter Reed National Military Medical Center, Bethesda, Maryland, USA.
3. University of British Columbia, Vancouver, British Columbia, Canada.
4. Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA.
5. Center for Brain Plasticity and Recovery, Department of Rehabilitation Medicine, Georgetown University Medical Center, Washington, DC, USA.