1. Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University: No 1, Ta-Hsueh Road, Tainan 701, Taiwan
2. Department of Physical Therapy, College of Health Science, Kaohsiung Medical University, Taiwan
3. Department of Rehabilitation Medicine, Kaohsiung Medical University Hospital, Taiwan
4. Department of Physical Therapy and Assistive Technology, National Yang-Ming University, Taiwan
5. Department of Biomedical Engineering, National Cheng Kung University, Taiwan
6. Medical Device Innovation Center, National Cheng Kung University, Taiwan
7. Department of Physical Therapy, College of Medicine, National Cheng Kung University, Taiwan