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The article to which this comment refers can be found at http.//dx.doi.org/10.1007/s00586-005-0926-2.
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Fritzell, P. Comment on “Clinical studies in spinal surgery” (B. Hanson and B. Kopjar). Eur Spine J 14, 726 (2005). https://doi.org/10.1007/s00586-005-0932-4
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DOI: https://doi.org/10.1007/s00586-005-0932-4