1. Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States
2. Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY, United States
3. Department of Anatomy and Neurobiology, University of California, Irvine, CA, United States
4. Department of Physical Medicine and Rehabilitation, University of California, Irvine, CA, United States
5. Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, United States
6. Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY, United States