Spine
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Retrospective case series. ⋯ 4.
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Retrospective national database analysis. ⋯ 3.
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Observational Study
Cervical spine clearance protocols in level 1 trauma centers in the United States.
Observational, cross-sectional. ⋯ 4.
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Retrospective assessment of risk factors using univariate and multivariate analyses. ⋯ 4.