Spine
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A prospective, randomized controlled study of patients with L5-S1 lumbar disc herniations, operated with endoscopic discectomy through an interlaminar or transforaminal approach. ⋯ 4.
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A retrospective cohort study. ⋯ 3.
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Retrospective case-control study. ⋯ 4.
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Case report and systematic review of the literature. ⋯ 4.
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Prospective randomized cohort study. ⋯ 2.