Spine
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Comparative Study
Immediate versus Delayed Surgical Treatment of Lumbar Disc Herniation for Acute Motor Deficits: The Impact of Surgical Timing on Functional Outcome.
A retrospective cohort study. ⋯ 3.
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A prospective study. ⋯ 2.
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Retrospective cohort study using prospectively collected registry data. ⋯ 3.
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Evaluation of the psychometric properties of a questionnaire. ⋯ 4.
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A genetic association (replication) study. ⋯ 4.