Spine
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A retrospective analysis of a prospective registry. ⋯ 2.
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Retrospective review of prospective patient outcomes and cost data. ⋯ 3.
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A prospective multicenter cohort study. ⋯ 2.
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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.