Jianru Xiao1, Shuai Han2, Ting Wang2, Dongjie Jiang2. 1. Department of Bone Tumor Surgery, Spine Tumor Center, Changzheng Hospital, Second Military Medical University, Fengyang Rd 415#, Huangpu District, Shanghai, China. jianruxiao83@163.com. 2. Department of Bone Tumor Surgery, Spine Tumor Center, Changzheng Hospital, Second Military Medical University, Fengyang Rd 415#, Huangpu District, Shanghai, China.