Spine
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A retrospective, single-center study. ⋯ 4.
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A retrospective chart review. ⋯ 4.
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Multicenter Study
Minimal Clinically Important Difference in Quality of Life for Patients with Low Back Pain.
Multicenter, prospective, cohort study. ⋯ 2.
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Retrospective analysis of prospective data. ⋯ 2.