1. Department of Neurosurgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
2. Department of Pediatrics, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3. Center for Pediatric Cancer, National Cancer Center, Goyang, Korea.
4. Department of Pediatric Neurosurgery, Severance Children’s Hospital, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Pediatrics, Seoul National University Children’s Hospital, Seoul National University College of Medicine, Seoul, Korea.