Spine
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Prospective observational cohort study. ⋯ 4.
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A systematic review. ⋯ 3.
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A retrospective review. ⋯ 4.
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Prospective cohort study. ⋯ 3.
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Retrospective study. ⋯ 4.
Prospective observational cohort study. ⋯ 4.
A systematic review. ⋯ 3.
A retrospective review. ⋯ 4.
Prospective cohort study. ⋯ 3.
Retrospective study. ⋯ 4.