1. Department of Neurosurgery, Seoul National University Hospital, Seoul, Korea.
2. Department of Neurosurgery, Pusan National University Hospital, Busan, Korea.
3. Department of Neurosurgery, Chungnam National University Sejong Hospital, Sejong, Korea.
4. Department of Neurosurgery, Gachon University Gil Medical Center, Incheon, Korea.
5. Department of Neurosurgery, Soonchunhyang University Seoul Hospital, Seoul, Korea.
6. Department of Internal Medicine, Chung-Ang University Gwangmyeong Hospital, Chung-Ang University College of Medicine, Gwangmyeong, Korea.
7. Department of Human Systems Medicine, Medical Statistics Laboratory, Seoul National University College of Medicine, Seoul, Korea.
8. Department of Neurosurgery, Cancer Research Institute and Ischemic/Hypoxic Disease Institute, Seoul National University College of Medicine, Seoul, Korea.
9. Advanced Institute of Convergence Technology, Seoul National University, Suwon, Korea.