Spine
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Retrospective case series. ⋯ 3.
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Randomized Controlled Trial Multicenter Study
Prospective, multicenter, randomized, controlled study of anular repair in lumbar discectomy: two-year follow-up.
Prospective, multicenter, single-blind, randomized, controlled clinical study. ⋯ 1.
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A retrospective study. ⋯ 4.
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Retrospective comparative study using prospectively collected data. ⋯ 2.
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Systematic review of interventions. ⋯ 2.