1. Department of Neurosurgery, Inje University College of Medicine, Seoul Paik Hospital, Seoul, Korea.
2. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.
3. Clinical Research Institute, Seoul National University Hospital, Seoul, Korea.
4. Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Korea.
5. Neuroscience Research Institute, Seoul National University Medical Research Center, Seoul, Korea.