Spine
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Systematic review and meta-analysis. ⋯ 4.
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Retrospective study of a national database. ⋯ 3.
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A cross-sectional study. ⋯ 2.
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Retrospective analysis. ⋯ 4.
Systematic review and meta-analysis. ⋯ 4.
Retrospective study of a national database. ⋯ 3.
A cross-sectional study. ⋯ 2.
Retrospective analysis. ⋯ 4.