1. Department of Physical Medicine and Rehabilitation Harvard Medical School Boston Massachusetts USA
2. Brigham and Women's Hospital Boston Massachusetts USA
3. Spaulding Rehabilitation Hospital Charlestown Massachusetts USA
4. University of Virginia Charlottesville Virginia USA
5. Lewis Katz School of Medicine at Temple University Philadelphia Pennsylvania USA
6. Icahn School of Medicine at Mount Sinai New York New York USA
7. Vanderbilt University Medical Center Nashville New York USA
8. Long School of Medicine, University of Texas Health Science Center at San Antonio San Antonio Texas USA