Pedicle screw fixation in single-level, double-level or multilevel posterior lumbar fusion for osteoporotic spine: A retrospective study with a minimum 2-year follow-up.
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D. Liang | Hui-zhi Guo | Dan-qing Guo | Yong-chao Tang | Yongxian Li | Kai Yuan | Shun-cong Zhang | Jian-cheng Peng | Yan-huai Ma | Jing-lan Li