1. U.S. Army Medical Center of Excellence, Army-Baylor University Doctoral Program in Physical Therapy, Fort Sam Houston, TX 78234, USA
2. Center for the Intrepid, Department of Rehabilitation Medicine, Brooke Army Medical Center, Fort Sam Houston, TX 78234, USA
3. Physical Therapy Services, Department of Rehabilitation Medicine, Brooke Army Medical Center, Fort Sam Houston, TX 78234, USA
4. Department of Physical Therapy, University of Pittsburgh, Pittsburgh, PA 15219, USA