1. Soft Robotics Research Center, Seoul National University, Seoul, Republic of Korea.
2. Department of Mechanical and Aerospace Engineering, Institute of Advanced Machines and Design, Seoul National University, Seoul, Republic of Korea.
3. The Rebikoff-Niggeler Foundation (FRN), Horta, Azores, Portugal.
4. School of Engineering and Applied Sciences and Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA, USA.