1. Division of Pediatric Neurosurgery, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul, Korea
2. Adolescent Cancer Center, Seoul National University Cancer Hospital, Seoul, Korea
3. Department of Neurosurgery, Seoul National University Hospital, Seoul, Korea
4. Department of Anatomy, Seoul National University Hospital, Seoul, Korea
5. Chong Kun Dang Research Institute, CKD Pharmaceuticals, Gyeonggi-do, Korea