Spine
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Retrospective matched cohort analysis. ⋯ 3.
-
This is a retrospective cohort study. ⋯ 4.
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Observational study. ⋯ 3.
-
Retrospective analysis. ⋯ 3.
Retrospective matched cohort analysis. ⋯ 3.
This is a retrospective cohort study. ⋯ 4.
Observational study. ⋯ 3.
Retrospective analysis. ⋯ 3.