1. Querrey Simpson Institute for Bioelectronics, Northwestern University, Chicago, IL 60611, USA.
2. Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA.
3. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, International Research Center for Computational Mechanics, Dalian University of Technology, Dalian 116023, China.
4. Sibel Inc., Evanston, IL 60208, USA.
5. Prosthetics-Orthotics Center, Northwestern University, Chicago, IL 60611, USA.
6. Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China.
7. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, School of Mechanical Engineering, Tianjin University, Tianjin, China.
8. University of Illinois College of Medicine at Chicago, Chicago, IL 60612, USA.
9. Department of Mechanical Engineering, Kyung Hee University, Yongin 17104, South Korea.
10. Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, South Korea.
11. Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA.
12. Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.
13. Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA.
14. Scheck & Siress Prosthetics and Orthotics, Schaumburg, IL 60173, USA.
15. Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
16. Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208, USA.