1. Rehabilitation Engineering Lab, Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Champaign, Illinois, USA
2. Department of Creative Product Design, Asia University, Taichung, Taiwan
3. Department of Biomedical Engineering, Hung Kuang University, Taichung, Taiwan
4. Department of Special Education, University of Illinois at Urbana-Champaign, Champaign, Illinois, USA
5. Department of Physical Medicine and Rehabilitation, Carle Foundation Hospital, Urbana, Illinois, USA