1. Department of Mechanical and Aerospace Engineering, University of California Irvine, Irvine, CA 92697, USA
2. Department of Anatomy and Neurobiology, University of California Irvine, Irvine, CA 92697, USA
3. College of Computing, Georgia Institute of Technology, Atlanta, GA 30332, USA
4. Department of Electrical Engineering and Computer Science, University of California Berkeley, Berkeley, CA 94720, USA
5. Department of Biomedical Engineering, University of California Irvine, Irvine, CA 92697, USA
6. AE Studio, Venice, CA 90291, USA
7. CAPES Foundation, Ministry of Education of Brazil, Brasilia 70040-020, Brazil
8. Rehabilitation Services, University of California Irvine, Irvine, CA 92697, USA