Spine
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Trajectories of Disability and Low Back Pain Impact: 2-year Follow-up of the Groningen Spine Cohort.
Prospective cohort study. ⋯ 2.
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Prospective study. ⋯ 2.
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Retrospective review of prospectively collected data. ⋯ 3.
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Retrospective review of consecutive series of patients treated at two institutions. ⋯ 3.
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A retrospective study. ⋯ 3.