1. Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
2. Division of Pediatric Neurosurgery, Seoul National University Children’s Hospital, Seoul, Korea.
3. Neuroscience Research Institute, Seoul National University Medical Research Center, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Pathology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
5. Center of Hospital Medicine, Seoul National University Hospital, Seoul, Korea.