1. The Institute of Ophthalmology and Optometry, Department of Ophthalmology, Ewha Womans University Mokdong Hospital, Ewha Womans University College of Medicine, Seoul, Korea.
2. Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. The Institute of Ophthalmology and Optometry, Department of Ophthalmology, Ewha Womans University Seoul Hospital, Ewha Womans University College of Medicine, Seoul, Korea.