Spine
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A case-control study. ⋯ 4.
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A pooled patient-level analysis of two multicenter randomized controlled trials and one multicenter single-arm prospective trial. ⋯ 1.
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Observational Study
Patient Reported Outcomes and Revision Rates at a Mean Follow-up of Ten Years After Lumbar Total Disc Replacement.
Prospective observational cohort study. ⋯ 3.
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A retrospective observational study. ⋯ N/A.