Spine
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Retrospective review of prospectively collected data. ⋯ 3.
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Prospective 2-year study with operative sampling and in-vitro analysis of chromium ions following spinal surgery in children. ⋯ 2.
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A retrospective study. ⋯ 3.
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Retrospective case series. ⋯ 4.
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Prospective single-center cohort study. ⋯ 2.