1. Department of Neurosurgery, Chuncheon Sacred Heart Hospital, Hallym University, Chuncheon, Korea
2. Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea
3. Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea
4. Department of Neurosurgery, Seoul National University Hospital, Seoul, Korea
5. Department of Neurosurgery, Seoul National University, Boramae Hospital, Seoul, Korea
6. Department of Neurosurgery, Seoul National University, Bundang Hospital, Seongnam, Korea
7. Department of Radiology, Seoul National University Hospital, Seoul, Korea