1. Department of Rehabilitation Medicine, Philadelphia, Pennsylvania, USA.
2. Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, USA.
3. Department of Physical Medicine and Rehabilitation, University of Miami Miller School of Medicine, Miami, Florida, USA.
4. Kessler Institute for Rehabilitation, West Orange, New Jersey, USA.
5. Department of Physical Medicine and Rehabilitation, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
6. Rutgers New Jersey Medical School, Newark, New Jersey, USA.
7. Biostatistics Division, Pharmacology and Experimental Therapeutics, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, USA.