1. Rice Neuroengineering Initiative, Rice University, Houston, TX, USA.
2. Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.
3. Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA.
4. Department of Physical Medicine and Rehabilitation, University of Utah, Salt Lake City, UT, USA.
5. Department of Electrical and Computer Engineering, Rice University, Houston, TX, USA.
6. Department of Materials Science & Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.
7. Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA.
8. Center for Neural Basis of Cognition, Pittsburgh, PA, USA.