Spine
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A retrospective analysis of national longitudinal database. ⋯ 3.
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A population-based birth cohort study. ⋯ 3.
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Prospective cohort. ⋯ 3.
A retrospective analysis of national longitudinal database. ⋯ 3.
A population-based birth cohort study. ⋯ 3.
Prospective cohort. ⋯ 3.