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Factors affecting the incidence of symptomatic adjacent-level disease in cervical spine after total disc arthroplasty: 2- to 4-year follow-up of 3 prospective randomized trials.
Nunley PD, Jawahar A, Kerr EJ 3rd, Gordon CJ, Cavanaugh DA, Birdsong EM, Stocks M, Danielson G. Nunley PD, et al. Among authors: birdsong em. Spine (Phila Pa 1976). 2012 Mar 15;37(6):445-51. doi: 10.1097/BRS.0b013e31822174b3. Spine (Phila Pa 1976). 2012. PMID: 21587111 Clinical Trial.