Spine
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Retrospective study. ⋯ 4.
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Retrospective analysis of Medicare claims and procedure details from a single institution participation in the Bundled Payments for Care Improvement (BPCI) program. ⋯ 3.
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In-vitro study of the tissue mechanics of annulus fibrosus. ⋯ N/A.
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A genetic association study. ⋯ 3.