Influence of bone cement distribution on outcomes following percutaneous vertebroplasty: a retrospective matched-cohort study oleh Ling Mo, Zixian Wu, De Liang, Linqiang Y, Zhuoyan Cai, Jinjing Huang, Shunxin Lin, Jianchao Cui, Shuncong Zhang, Zhidong Yang, Zhensong Yao, Xiaobing Jiang