1. From the Department of Ophthalmology, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul, Korea;
2. Department of Ophthalmology, Seoul National University Borame Hospital, Seoul, Korea;
3. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea; and
4. Department of Ophthalmology, Konyang University School of Medicine, Kim's Eye Hospital, Seoul, South Korea.