后路寰枢椎椎弓根钉内固定及枕颈融合术治疗上颈椎不稳27例临床分析
후로환추추추궁근정내고정급침경융합술치료상경추불은27례림상분석
Posterior atlantoaxial pedicle screw fixation and occipital-cervical fusion of upper cervical instability:a report of 27 cases
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