1. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43220, USA.
2. Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
3. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
4. Department of Engineering Physics, University of Wisconsin-Madison, Madison, WI 53706, USA.
5. Chronic Brain Injury Program, The Ohio State University, Columbus, OH 43220, USA.