1. Laboratory for Soft Machines & Electronics School of Packaging Michigan State University East Lansing MI 48824 USA
2. Department of Civil and Environmental Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
3. Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 China
4. Department of Biomedical Engineering City University of Hong Kong Kowloon Tong Hong Kong China
5. Departments of Electrical and Computer Engineering, Mechanical Engineering Michigan State University East Lansing MI 48824 USA