Spine
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A retrospective study. ⋯ 3.
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Epidemiological study based on cross-sectional data of a representative sample. ⋯ 3.
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Retrospective cohort. ⋯ 3.
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An in vivo study examining the functional osseointegration of smooth, rough, and porous surface topographies presenting polyether-ether-ketone (PEEK) or titanium surface chemistry. ⋯ N/A.