Spine
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Retrospective cohort study. ⋯ 3.
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Validation study. ⋯ 3.
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Comparative Study
Adjacent segment pathology requiring reoperation after anterior cervical arthrodesis: the influence of smoking, sex, and number of operated levels.
A retrospective study. ⋯ 3.
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A retrospective, radiographical study. ⋯ 4.