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Zweig, Thomas; Hemmeler, Christoph; Aghayev, Emin; Melloh, Markus; Etter, Christian; Röder, Christoph (2011). Influence of preoperative nucleus pulposus status and radiculopathy on outcomes in mono-segmental lumbar total disc replacement: results from a nationwide registry. BMC musculoskeletal disorders, 12(1), p. 275. London: BioMed Central 10.1186/1471-2474-12-275