Spine
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A retrospective database analysis. ⋯ 3.
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A prospective questionnaire. ⋯ 3.
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Biomechanical, cadaveric study. ⋯ N/A.
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Retrospective analysis of billing data, medical records, and hospital cost data. ⋯ 4.
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Laboratory/animal-based proof of principle study. ⋯ N/A.