1. Department of Rehabilitation Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas
2. Department of Neuropsychology, Polytrauma Rehabilitation Center, South Texas Veterans Health Care System, San Antonio, Texas
3. Department of Physical Medicine and Rehabilitation, Center for Rehabilitation Sciences and Engineering, Virginia Commonwealth University, Richmond, Virginia
4. Polytrauma Rehabilitation Center, South Texas Veterans Health Care System, San Antonio, Texas