1. School of Arts and Design, Guilin University of Electronic Technology, Guilin 541004, China
2. Faculty of Engineering, McMaster University, Hamilton, ON L8S 4L8, Canada
3. Department of Mechanical Engineering, Lassonde School of Engineering, York University, Toronto, ON M3J 1P3, Canada
4. Institute of Rehabilitative Engineering & Technology, University of Shanghai for Science and Technology, Shanghai 200093, China