1 Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Ophthalmology, School of Medicine, National Yang-Ming University, Taipei, Taiwan.
2 Department of Physical Medicine and Rehabilitation, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan, Taiwan; Institute of Public Health, National Yang-Ming University, Taipei, Taiwan.
3 Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei, Taiwan.
4 Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Ophthalmology, School of Medicine, National Yang-Ming University, Taipei, Taiwan. Electronic address: agwang@vghtpe.gov.tw.