1. Department of Mechanical Engineering, Northeastern University, Boston, MA, USA
2. Department of Mechanical Engineering and the Institute for Experiential Robotics, Northeastern University, Boston, MA, USA
3. Woodruff School of Mechanical Engineering and the Institute for Robotics and Intelligent Machines, Georgia Institute of Technology, Atlanta, GA, USA
4. Department of Mechanical Engineering, the Department of Physical Therapy, Movement, and Rehabilitation Science, and the Institute for Experiential Robotics, Northeastern University, Boston, MA, USA