1. Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, TX, USA
2. Department of Biostatistics, University of Alabama at Birmingham, Birmingham, AL, USA
3. Department of Physical Medicine and Rehabilitation, Virginia Commonwealth University, Richmond, VA, USA
4. Department of Psychology, Wayne State University, Detroit, MI, USA
5. Santa Clara Valley Medical Center & Rusk Institute for Rehabilitation Medicine, San Jose, CA, USA