1. Department of Neurosurgery, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
2. Department of Neurosurgery, Ajou University School of Medicine, 206, World cup-ro, Yeongtong-gu, Suwon-si 16499, Republic of Korea
3. Department of Orthopedic Surgery, College of Medicine, Korea University, 73, Korea-daero, Seongbuk-gu, Seoul 02841, Republic of Korea
4. Institute of Medical Science, Ajou University School of Medicine, 206, World cup-ro, Yeongtong-gu, Suwon-si 16499, Republic of Korea
5. Department of Orthopedic Surgery and Nano-Based Disease Control Institute, Korea University Guro Hospital, 148, Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea
6. Department of Neurosurgery, Spine and Spinal Cord Institute, Severance Hospital, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea