1. Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea;
2. Department of Neurosurgery, Seoul National University Hospital, Seoul, Republic of Korea;
3. Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Republic of Korea;
4. Department of Brain and Cognitive Sciences, Seoul National University College of Natural Science, Seoul, Republic of Korea