1. Department of Physical Medicine and Rehabilitation, Taipei Veterans General Hospital, Taipei, Taiwan
2. Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan
3. Department of Optometry, University of Kang Ning, Taipei, Taiwan
4. Department of Physical Medicine and Rehabilitation, Taipei Veterans General Hospital, Yuan-Shan Branch, Yilan, Taiwan
5. National Yang-Ming Chiao-Tung University, School of Medicine, Taipei, Taiwan