1. Department of Materials Science and Engineering, McCormick School of Engineering, Northwestern University, Evanston, IL 60208, USA.
2. Epicore Biosystems Inc., Evanston, IL 60208, USA.
3. Center for Bio-Integrated Electronics, Northwestern University, Evanston, IL 60208, USA.
4. Gatorade Sports Science Institute, 617 W. Main St., Barrington, IL 60010, USA.
5. Departments of Biomedical Engineering, Mechanical Engineering, and Electrical Engineering and Computer Science, McCormick School of Engineering, Northwestern University, Evanston, IL 60208, USA.
6. Department of Chemistry, Weinberg College of Arts and Sciences, Northwestern University, Evanston, IL 60208, USA.
7. Department of Neurological Surgery, Feinberg School of Medicine, and Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, IL 60611, USA.