1. Department of Ophthalmology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
2. Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea.
3. Department of Ophthalmology, Inje University College of Medicine, Goyang, Korea.
4. Department of Ophthalmology, Sungkyunkwan University College of Medicine, Seoul, Korea.
5. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.