Spine
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A case-control study. ⋯ 4.
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Longitudinal design. A cohort followed in 3 waves of data collection. ⋯ 3.
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A prospective study. ⋯ 3.
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Retrospective cohort study. ⋯ 3.
A case-control study. ⋯ 4.
Longitudinal design. A cohort followed in 3 waves of data collection. ⋯ 3.
A prospective study. ⋯ 3.
Retrospective cohort study. ⋯ 3.