1. Department of Ophthalmology, Hanyang University College of Medicine, Seoul, Korea
2. Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, United States
3. Department of Nephrology, Ajou University School of Medicine, Suwon, Korea
4. Department of Ophthalmology, Hanyang University College of Medicine, Seoul, Korea 2Massachusetts Eye and Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, United States