1. Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Ophthalmology, Inje University Sanggye Paik Hospital, Seoul, Korea.
3. Department of Biostatistics, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Department of Neurosurgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Ophthalmology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.