1. Department of Ophthalmology, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
3. Department of Ophthalmology, Incheon St. Mary's Hospital, The Catholic University of Korea College of Medicine, Incheon, Korea.