Spine
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Meta Analysis Comparative Study
Cervical Disc Arthroplasty Versus Anterior Cervical Discectomy and Fusion for Incidence of Symptomatic Adjacent Segment Disease: A Meta-Analysis of Prospective Randomized Controlled Trials.
Meta-analysis of randomized controlled trials. ⋯ 1.
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Retrospective review of a prospective cohort. ⋯ 3.
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Prospective randomized cohort study. ⋯ 2.
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Retrospective study. ⋯ 3.