1. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea
2. Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea
3. Department of Ophthalmology, Seoul National University Boramae Medical Center, Seoul, Korea
4. Department of Ophthalmology, Dongguk University Ilsan Hospital, Goyang, Korea
5. Department of Biostatistics, Seoul National University Boramae Medical Center, Seoul, Korea