1. Department of Rehabilitation Medicine, Center for the Intrepid, Brooke Army Medical Center, Sam Houston, TX 78234, USA
2. Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD 20817, USA
3. Department of Rehabilitation Medicine, Uniformed Services University, Bethesda, MD 20814, USA
4. Extremity Trauma and Amputation Center of Excellence, Sam Houston, TX 78234, USA