1. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
2. Department of Neuroscience, The Burke Medical Research Institute, Weill Medical College of Cornell University, New York, NY, USA
3. Department of Neurology, University of Maryland School of Medicine, Baltimore, MD, USA
4. Rehabilitation Hospital of Rhode Island, RI, USA
5. Department of Clinical Neurosciences, Brown Medical School, Providence, RI, USA
6. Spaulding Rehabilitation Hospital, Boston, MA, USA
7. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA, USA
8. Department of Brain and Cognitive Science, Massachusetts Institute of Technology, Cambridge, MA, USA