1. Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15213, USA.
2. Center for the Neural Basis of Cognition, Pittsburgh, PA 15213, USA.
3. Department of Physical Medicine and Rehabilitation, University of Pittsburgh, Pittsburgh, PA 15213, USA.
4. Department of Veterans Affairs Medical Center, Pittsburgh, PA 15206, USA.
5. Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA.
6. McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA.
7. Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA.
8. Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA 15213, USA.
9. Systems Neuroscience Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA.