Spine
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Systematic review. ⋯ 1.
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Retrospective cohort. ⋯ 4.
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A retrospective cohort study of a nationwide sample database. ⋯ 4.
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Retrospective cohort study. ⋯ 3.
Systematic review. ⋯ 1.
Retrospective cohort. ⋯ 4.
A retrospective cohort study of a nationwide sample database. ⋯ 4.
Retrospective cohort study. ⋯ 3.