Shangzhi Gao1, Maolin He2. 1. Division of Spinal Surgery, The First Affiliated Hospital of Guangxi Medical University, No. 6 Shuangyong Rd, Nanning, Guangxi, 530021, China. 2. Division of Spinal Surgery, The First Affiliated Hospital of Guangxi Medical University, No. 6 Shuangyong Rd, Nanning, Guangxi, 530021, China. 274783289@qq.com.