1. Department of Rehabilitation Medicine, Taipei City Hospital, Taipei City 11556, Taiwan
2. School of Medicine, National Yang Ming Chiao Tung University, Taipei City 11221, Taiwan
3. Department of Physical Therapy and Assistive Technology, National Yang Ming Chiao Tung University, Taipei City 11221, Taiwan
4. Department of Physical Medicine and Rehabilitation, Taipei Veterans General Hospital, Taipei City 11217, Taiwan