Spine
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Retrospective cohort study. ⋯ 3.
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A prospective study. ⋯ 3.
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Matched case-control epidemiological study. ⋯ 4.
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Human stromal stem cells derived from menstrual blood (MenSCs) and nucleus pulposus (NP) cells were cocultured under normal or low oxygen (O2) condition. ⋯ N/A.
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Retrospective cohort. ⋯ 4.