1. Department of Physical Therapy and Assistive Technology, National Yang Ming Chiao Tung University, Taipei, Taiwan
2. Department of Physical Therapy and Assistive Technology, National Yang Ming Chiao Tung University, Taipei, Taiwan,
3. Harvard Medical School, Boston, MA, USA,
4. Department of Engineering, Loyola University Chicago, Chicago, IL, USA
5. School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan,