1. Department of Physical Medicine and Rehabilitation, Center for Rehabilitation Sciences Research, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
2. The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD, USA
3. Department of Orthopaedics, Walter Reed National Military Medical Center, Bethesda, MD, USA
4. National Intrepid Center of Excellence, Walter Reed National Military Medical Center, Bethesda, MD, USA
5. Center for Neuroscience and Regenerative Medicine, Bethesda, MD, USA
6. Bureau of Medicine and Surgery, Wounded, Ill and Injured, US Navy, Falls Church, VA, USA
7. Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, MD, USA