Spine
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Validation study with cross-sectional and longitudinal measurements. ⋯ N/A.
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Retrospective cohort study. ⋯ 3.
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Observational Study
Prolonged Preoperative Opioid Therapy in Patients with Degenerative Lumbar Stenosis in a Workers' Compensation Setting.
Retrospective cohort study. ⋯ 3.
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Cross-sectional survey. ⋯ 3.
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Clinical case series. ⋯ 4.