Spine
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Cross-sectional survey. ⋯ 4.
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This is a retrospective cohort study. ⋯ 4.
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Immunohistochemical and real-time reverse transcription-polymerase chain reaction (RT-PCR) analysis. ⋯ N/A.
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Retrospective analysis. ⋯ 3.
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Animal experimental study. ⋯ N/A.