1. Department of Physical Medicine and Rehabilitation, Vanderbilt University Medical Center, Nashville, TN, USA
2. Department of Physical Medicine, Rehabilitation, and Sports Medicine, University of Puerto Rico School of Medicine, San Juan, Puerto Rico
3. Harvard Medical School, Boston, MA, USA
4. New England GRECC, VA Boston Healthcare System, MA, USA
5. National Institutes of Health, Bethesda, MD, USA
6. Northwestern Feinberg Medical School and Rehabilitation Institute of Chicago, IL, USA
7. Oregon Health & Science University, Portland, OR, USA
8. Boston University, MA, USA
9. Florida International University, Miami, FL, USA
10. Indiana University School of Medicine and Rehabilitation Hospital of Indiana, Indianapolis, IN, USA
11. Washington University School of Medicine, St Louis, MO, USA
12. University of Texas Medical Branch, Galveston, TX, USA
13. Jackson Veteran’s Administration Medical Center, MS, USA
14. Medical University of South Carolina, Charleston, SC, USA