1. Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.
2. Center for Bio-Integrated Electronics, Simpson Querrey Institute for BioNanotechnology, Northwestern University, Evanston, IL 60208, USA.
3. Department of Biomedical Engineering, University of Arizona, Tucson, AZ 85721, USA.
4. Materials Sciences Research Center, Japan Atomic Energy Agency Tokai, Ibaraki 319-1195, Japan.
5. Epicore Biosystems Inc., Cambridge, MA 02139, USA.
6. Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA.
7. Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA.
8. Functional Material and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, Victoria 3000, Australia.
9. Department of Mechanical Engineering, Ajou University, San 5, Woncheon-Dong, Yeongtong-Gu, Suwon 16499, Republic of Korea.
10. Department of Electronics Convergence Engineering, Kwangwoon University, Seoul 01897, Republic of Korea.
11. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
12. Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
13. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.