Spine
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Retrospective review of a prospectively collected multicenter database. ⋯ 2.
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A cross-sectional, retrospective cohort study. ⋯ 3.
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A retrospective review of prospectively collected data. ⋯ 3.
Retrospective review of a prospectively collected multicenter database. ⋯ 2.
A cross-sectional, retrospective cohort study. ⋯ 3.
A retrospective review of prospectively collected data. ⋯ 3.