Spine
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Cross-sectional study. ⋯ 3.
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Retrospective clinical study. ⋯ 4.
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Meta Analysis
Does heterotopic ossification affect the outcomes of cervical total disc replacement? A meta-analysis.
Meta-analysis. ⋯ 2.
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This is a secondary analysis of a cross-sectional population-based survey. ⋯ 3.
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Abnormal findings on magnetic resonance images of the cervical spines in 1211 asymptomatic subjects.
Cross-sectional study. ⋯ 2.