Spine
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Four-year, longitudinal cohort study. ⋯ 3.
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Observational cross-sectional study. ⋯ 4.
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A retrospective study. ⋯ 3.
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Case series. ⋯ 5.
Four-year, longitudinal cohort study. ⋯ 3.
Observational cross-sectional study. ⋯ 4.
A retrospective study. ⋯ 3.
Case series. ⋯ 5.