1. Department of Orthopedic Surgery; CHA University, CHA Bundang Medical Center; 59 Yaptapro Seongnam-si 13496 South Korea
2. Department of Biomedical Science, College of Life Science; CHA University; 335 Pangyo-ro Bundang-gu Seongnam-si 13488 Korea
3. Department of Neurosurgery; CHA University, CHA Bundang Medical Center; 59 Yaptapro Seongnam-si 13496 South Korea
4. Department of Neurosurgery; Baylor College of Medicine; Houston Texas