Spine
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Retrospective. ⋯ 4.
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A retrospective analysis of functional limitations due to stiffness after long-level spinal instrumented fusion surgery to correct lumbar degenerative flat back was performed. ⋯ 3.
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Retrospective cohort study. ⋯ 3.
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Cross-sectional population-level health survey. ⋯ 2.
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Retrospective analysis of a prospectively collected, national inpatient hospital database. ⋯ 2.