1. Harvard John A. Paulson School of Engineering and Applied Sciences Harvard University Boston MA 02134 USA
2. Soft Robotics Research Center Seoul National University Seoul 08826 South Korea
3. Department of Mechanical Engineering Institute of Advanced Machines and Design Institute of Engineering Research Soft Robotics Research Center Seoul National University Seoul 08826 South Korea
4. Department of Physical Education Institute of Sport Science Soft Robotics Research Center Seoul National University Seoul 08826 South Korea