Spine
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A retrospective study. ⋯ 3.
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A retrospective cohort study. ⋯ 4.
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A prospective single-center study. ⋯ 5.
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Retrospective review of prospective data. ⋯ 3.
A retrospective study. ⋯ 3.
A retrospective cohort study. ⋯ 4.
A prospective single-center study. ⋯ 5.
Retrospective review of prospective data. ⋯ 3.