1. Mayo Clinic Department of Physical Medicine & Rehabilitation, Rochester, MN, USA
2. Physical Medicine and Rehabilitation, Indiana University School of Medicine and Rehabilitation Hospital of Indiana, Indianapolis, IN, USA
3. UPMC Mercy Hospital Rehabilitation Institute, Pittsburgh, PA, USA
4. The Ohio State University Wexner Medical Center, Columbus, OH, USA
5. Department of Rehabilitation, Baylor Institute for Rehabilitation-Dallas Campus, Dallas, TX, USA
6. NYP/Cornell-Weill Medical Center, New York, NY, USA