1. Department of Ophthalmology, Taipei Tzu Chi Hospital, The Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan
2. School of Medicine, Tzu Chi University, Hua-Liang, Taiwan
3. Department of Ophthalmology, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan
4. Graduate Institute and Department of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan