Spine
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Cross-sectional study. ⋯ 3.
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Retrospective cohort study. ⋯ 3.
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Systematic review and meta-analysis. ⋯ 3.
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A retrospective study. ⋯ 4.
Cross-sectional study. ⋯ 3.
Retrospective cohort study. ⋯ 3.
Systematic review and meta-analysis. ⋯ 3.
A retrospective study. ⋯ 4.