Spine
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Systematic review. ⋯ 5.
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A prospective study. ⋯ 3.
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A retrospective study. ⋯ 4.
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A prospective cohort study. ⋯ 3.
Systematic review. ⋯ 5.
A prospective study. ⋯ 3.
A retrospective study. ⋯ 4.
A prospective cohort study. ⋯ 3.