1. Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea.
3. Medical Research Collaborating Center, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.