1. Department of Neurosurgery, CHA Bundang Medical Center, CHA University, 59 Yatap-ro, Bundang-gu, Seongnam-si 13496, Gyeonggi-do, Republic of Korea
2. Department of Life Science, CHA University, Boondagger, Seongnam-si 13493, Gyeonggi-do, Republic of Korea
3. Department of Neurosurgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul 16419, Republic of Korea
4. Department of Neurosurgery, Chungbuk National University College of Medicine, Chungbuk National University Hospital, Seowon-gu, Cheongju-si 28644, Chungcheong-do, Republic of Korea