Spine
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Retrospective analysis of prospectively collected data. ⋯ 3.
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Retrospective review of institutional data. ⋯ 4.
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Reproducibility of measurements. ⋯ 2.
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Sub-analysis of the prospective AOSpine CSM North America and International studies. ⋯ 2.
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In vitro Study. ⋯ N/A.