1. Department of Neurosurgery, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea
2. Division of Cancer Registration and Surveillance, National Cancer Center, Goyang, Republic of Korea
3. Department of Neurosurgery, Seoul National University Bundang Hospital, Gyeonggi-Do, Republic of Korea
4. Department of Neuro-Oncology Clinic, National Cancer Center, Goyang, Republic of Korea