1. Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
2. Robotics Institute, University of Michigan, Ann Arbor, MI 48109, USA.
3. Department of Physical Medicine and Rehabilitation, University of Michigan, Ann Arbor, MI 48109, USA.
4. University of Michigan Hospital Orthotics and Prosthetics Center, Ann Arbor, MI 48109, USA.
5. School of Kinesiology, University of Michigan, Ann Arbor, MI 48109, USA.
6. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
7. Section of Plastic Surgery, University of Michigan, Ann Arbor, MI 48109, USA.
8. Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109, USA.
9. Neuroscience Graduate Program, University of Michigan, Ann Arbor, MI 48109, USA.