1. Department of Biostatistics and The Center for Rehabilitation Science and Engineering, Virginia Commonwealth University, Richmond, VA, USA
2. Department of Physical Medicine and Rehabilitation, Virginia Commonwealth University, Richmond, VA, USA
3. Kessler Foundation Research Center, West Orange, NJ, USA
4. Department of Physical Medicine and Rehabilitation, UMDNJ – New Jersey Medical School, Newark, NJ, USA
5. Rehabilitation Research Center, Santa Clara Valley Medical Center, CA, USA
6. Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, Birmingham, AL, USA