1. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
2. Department of Mechanical Engineering, Ajou University, San 5, Woncheon-Dong, Yeongtong-Gu, Suwon 16499, Republic of Korea.
3. Department of Electronics Convergence Engineering, Kwangwoon University, Seoul, Republic of Korea.
4. Applied Mechanics Laboratory, Department of Engineering Mechanics, Center for Mechanics and Materials, Tsinghua University, Beijing 100084, China.
5. Department of Civil and Environmental Engineering, Mechanical Engineering, and Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.
6. Departments of Materials Science and Engineering, Biomedical Engineering, Neurological Surgery, Chemistry, Mechanical Engineering, Electrical Engineering and Computer Science; Center for Bio-Integrated Electronics; Simpson Querrey Institute for Nano/Biotechnology; Northwestern University, Evanston, IL 60208, USA.
7. Neurology and Sleep Medicine Carle Physician Group, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
8. School of Materials Science and Engineering, Pusan National University, Busan 609-735, Republic of Korea.
9. Weldon School of Biomedical Engineering, School of Mechanical Engineering, Center for Implantable Devices, Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA.
10. Department of Engineering Mechanics, Southeast University, Nanjing 210096, China.