Spine
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Retrospective cohort study. ⋯ 3.
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Registry-based repeated-measures psychometric validation of the Danish Oswestry Disability Index (ODI). ⋯ 4.
Retrospective cohort study. ⋯ 3.
Registry-based repeated-measures psychometric validation of the Danish Oswestry Disability Index (ODI). ⋯ 4.