1. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
2. Seoul Artificial Eye Center, Clinical Research Institute, Seoul National University Hospital, Seoul, Korea.
3. Seoul National University Hospital, Health Care System Gangnam Center, Healthcare Research Institute, Seoul, Korea.
4. Department of Ophthalmology, Seoul National University Boramae Hospital, Seoul, Korea.
5. Department of Ophthalmology, Seoul National University Bundang Hospital, Seongnam, Korea.