1. Department of Neurosurgery, Brain Tumor Center, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Neurosurgery, Kangwon National University College of Medicine, Chuncheon, Korea.
3. Department of Neurosurgery, Bundang Jesaeng General Hospital, Seongnam, Korea.
4. Department of Neurosurgery, Neuro-Oncology Clinic, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.