1. Department of Ophthalmology, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Ophthalmology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
3. Department of Ophthalmology, School of Medicine, Kangbuk Samsung Medical Center, Sungkyunkwan University, Seoul, Korea.
4. Department of Ophthalmology, Chonnam National University Medical School, Gwangju, Korea.
5. The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.