1. Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania
2. Center for Neuroengineering and Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania
3. Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
4. Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, California
5. Department of Neurology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
6. Department of Physical Medicine and Rehabilitation, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania