Spine
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Retrospective analysis. ⋯ 3.
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Observational cross-sectional population study using national sample of pediatric hospital discharges from 2000 to 2009. ⋯ 4.
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A retrospective clinical study. ⋯ 4.
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Prospective interventional study. ⋯ 2.
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Human volunteers were exposed experimentally to multidirectional seated perturbations. ⋯ N/A.