Spine
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A retrospective cohort study from a single institution. ⋯ 3.
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Comparative Study
Minimum Three-Year Follow-up of Specific Functional Disabilities After Multi-Level Lumbar Fusion: Comparison of Long-Level and Short-Level Fusion.
Retrospective case-control study. ⋯ 3.
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Prospective cohort study. ⋯ 2.
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Retrospective comparative study. ⋯ 3.