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TDA versus ACDF for cervical disc disease: forest plot for NDI, VAS of arm pain and neck pain, SF-36 PCS. ACDF = anterior cervical discectomy and fusion, CI = confidence interval, NDI = neck disability index, SF-36 PCS = SF-36 physical component scores, TDA = total disc arthroplasty, VAS = visual analog scale, WMD = weighted mean difference.
