1. Department of Ophthalmology, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea
2. Department of Ophthalmology, Yeungnam University, College of Medicine, Daegu, Korea
3. Department of Ophthalmology, Daegu Veterans Health Service Medical Center, Daegu, Korea
4. Department of Clinical Epidemiology and Biostatistics, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea
5. Department of Ophthalmology, Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea
6. Department of Ophthalmology, Seoul National University, College of Medicine, Seoul National University Hospital, Seoul, Korea