Spine
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Case report. ⋯ 5.
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A retrospective study. ⋯ 3.
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A retrospective minimum 20-year follow-up study using 4 standard self-administered questionnaires, one of which, the SRS-22 was also administered to control groups. ⋯ 4.
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Retrospective analysis of data from patients participating in the Lumbar Spinal Stenosis Outcome Study (LSOS). ⋯ 3.
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Cross-sectional study. ⋯ 3.