1. Center for Neuroengineering & Therapeutics, University of Pennsylvania, 3320 Smith Walk, 301 Hayden Hall, Philadelphia, PA 19104, USA
2. Department of Neurology, University of Pennsylvania, 3320 Smith Walk, 301 Hayden Hall, Philadelphia, PA 19104, USA
3. Department of Physical Medicine & Rehabilitation, University of Pennsylvania, 3320 Smith Walk, 301 Hayden Hall, Philadelphia, PA 19104, USA
4. Department of Bioengineering, University of Pennsylvania, 3320 Smith Walk, 301 Hayden Hall, Philadelphia, PA 19104, USA