1. Department of Ophthalmology, Kyung Hee University School of Medicine, Seoul, Korea.
2. Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea.
3. Department of Ophthalmology, Hanyang University College of Medicine, Seoul, Korea.
4. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.