1. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Ophthalmology, The Armed Forces Capital Hospital, Seongnam, Korea.
3. Department of Ophthalmology, Seoul National University Boramae Medical Center, Seoul, Korea.
4. Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea.
5. Department of Ophthalmology, Seoul National University Bundang Hospital, Seongnam, Korea.