1. Department of Neurosurgery, Bundang CHA Medical Center, CHA University College of Medicine, Seongnam;
2. Department of Neurosurgery, Dong-A University Hospital, Dong-A University College of Medicine, Busan;
3. Department of Neurosurgery, Brain Tumor Center, Severance Hospital, Yonsei University College of Medicine, Seoul;
4. Department of Neurosurgery, Brain Tumor Center, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul;
5. Department of Neurosurgery, Ajou University Hospital, Ajou University College of Medicine, Suwon; and
6. Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea