A new mathematical model for evaluating surface changes in the mid-abdominal sagittal plane after two-level pedicle reduction osteotomy in patients with ankylosing spondylitis by Wen Yin, Guohui Zheng, Wei Zhang, Yunlei Zhai, Haijiang Li, Lele Sun, Kangkang Wang, Jishi Jiang, Zikai Hua, Xilong Cui, Haiyang Yu

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