1. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
2. Department of Ophthalmology, Seoul National University Bundang Hospital, Seongnam, Korea
3. S eye Center, Ansan, Korea
4. Department of Ophthalmology, DongGuk University International Hospital, Goyang, Korea
5. Department of Ophthalmology, Seoul Municipal Boramae Hospital, Seoul, Korea
6. Department of Ophthalmology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea