Spine
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A prospective cohort study. ⋯ 2.
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A retrospective subgroup analysis was performed on surgically treated patients from the lumbar spinal stenosis (SpS) arm of the Spine Patient Outcomes Research Trial (SPORT), randomized, and observational cohorts. ⋯ 2.
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Retrospective analysis of a prospectively maintained surgical registry. ⋯ 4.
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A prospective, population-based, birth cohort study. ⋯ 2.
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Secondary analysis of randomized and nonrandomized prospective cohorts. ⋯ 2.