Spine
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A prospective cohort study. ⋯ 3.
-
Retrospective cohort study. ⋯ 3.
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Cohort. ⋯ 4.
-
Retrospective review of prospectively collected data. ⋯ 4.
A prospective cohort study. ⋯ 3.
Retrospective cohort study. ⋯ 3.
Cohort. ⋯ 4.
Retrospective review of prospectively collected data. ⋯ 4.