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Efficacy outcomes. (A–C): Comparison with baseline in each group. (A): WOMAC‐A pain subscale. (B): WOMAC‐C function subscale. (C): Total WOMAC. (D): OMERACT‐OARSI Responder Index Criteria. Abbreviation: HA, hyaluronic acid; MSC, mesenchymal stromal cell; WOMAC, Western Ontario and Mc Master Universities Arthritis Index.
