Spine
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A level-3 retrospective cohort analysis. ⋯ 3.
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Retrospective single-center study. ⋯ N/A.
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Observational Study
Technical and Nontechnical Skills in Surgery: A Simulated Operating Room Environment Study.
Observational simulation study. ⋯ 3.
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Genetic case-control study of single nucleotide polymorphisms (SNPs). ⋯ 4.
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Retrospective cohort study. ⋯ 4.