1. Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Ophthalmology, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.
6. Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.