1. Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Pediatrics, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea.
3. Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea.
4. MEG Center, Seoul National University Hospital, Seoul, Korea.
5. Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.