Spine
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Retrospective database study. ⋯ 4.
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A retrospective, case series. ⋯ 4.
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Retrospective cohort study of a nationwide sample database. ⋯ 4.
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A retrospective cohort study. ⋯ 4.
Retrospective database study. ⋯ 4.
A retrospective, case series. ⋯ 4.
Retrospective cohort study of a nationwide sample database. ⋯ 4.
A retrospective cohort study. ⋯ 4.