1. Department of Neurosurgery, Gyeongsang National University School of Medicine and Gyeongsang National, University Hospital, Jinju, Korea.
2. Department of Neurosurgery, College of Medicine, Gyeongsang National University and Institute of Health, Sciences, Jinju, Korea.
3. Department of Neurosurgery, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
4. Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.