Spine
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Cross-sectional study. ⋯ 5.
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Retrospective study. ⋯ 4.
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A retrospective cohort study. ⋯ 3.
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Clinical case series and risk factor analysis of dysphagia after occipitospinal fusion (OSF). ⋯ 4.
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A retrospective database review. ⋯ 4.