1. Department of Neuroscience, Graduate School, College of Medicine, Chungbuk National University, Cheongju, Republic of Korea
2. Department of Neurosurgery, Chungbuk National University Hospital, Cheongju, Republic of Korea
3. Department of Orthopedic Surgery, Chungbuk National University Hospital, Cheongju, Republic of Korea
4. Department of Neurosurgery, Gamma Knife Icon Center, Chungbuk National University Hospital, Cheongju, Republic of Korea
5. Institute for Stem Cell & Regenerative Medicine (ISCRM), Chungbuk National University, Cheongju, Republic of Korea