1. Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
2. Institute of Public Health, Department of Public Health, National Yang-Ming University, Taipei, Taiwan
3. Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan3Department of Ophthalmology, Faculty of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
4. Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei, Taiwan