Spine
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Prospective multicenter cohort study. ⋯ 2.
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Prospective cohort study. ⋯ 2.
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A retrospective case-control study. ⋯ 3.
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Systematic review. ⋯ 4.
Prospective multicenter cohort study. ⋯ 2.
Prospective cohort study. ⋯ 2.
A retrospective case-control study. ⋯ 3.
Systematic review. ⋯ 4.