1. Department of Biomedical Engineering, University of Utah, Salt Lake City, UT 84112, USA.
2. Department of Neurosurgery, University of Utah, Salt Lake City, UT 84112, USA.
3. Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA.
4. Department of Physical Medicine and Rehabilitation, University of Utah, Salt Lake City, UT 84112, USA.
5. Department of Orthopaedics, University of Utah, Salt Lake City, UT 84112, USA.
6. Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.