Spine
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A retrospective cohort study. ⋯ 3.
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Retrospective analysis. ⋯ 3.
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A retrospective cohort study of prospectively collected data. ⋯ 3.
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A retrospective cohort study. ⋯ 3.
A retrospective cohort study. ⋯ 3.
Retrospective analysis. ⋯ 3.
A retrospective cohort study of prospectively collected data. ⋯ 3.
A retrospective cohort study. ⋯ 3.