1 Department of Neurosurgery, Division of Spine, China, International Neurological Institute, Xuanwu Hospital, Capital Medical University, 45 Changchun Street, Beijing, 100053, People's Republic of China.
2 Department of Neurosurgery, Division of Spine, China, International Neurological Institute, Xuanwu Hospital, Capital Medical University, 45 Changchun Street, Beijing, 100053, People's Republic of China. chenzan66@163.com.
3 Department of Neurosurgery, Division of Spine, China, International Neurological Institute, Xuanwu Hospital, Capital Medical University, 45 Changchun Street, Beijing, 100053, People's Republic of China. jianfengzeng@xwh.ccmu.edu.cn.