Spine
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Retrospective analysis. ⋯ 4.
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A retrospective database review. ⋯ 4.
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Delphi process with multiple iterative rounds using a nominal group technique. ⋯ 5.
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A hospital-based retrospective epidemiological study. ⋯ 3.
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This study was a retrospective-cohort design involving a review of patient medical and cost records and a 2-year postsurgery follow-up outcome survey. ⋯ 3.