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Fritz JM, Delitto A, Erhard RE.Fritz JM, et al.Spine (Phila Pa 1976). 2003 Jul 1;28(13):1363-71; discussion 1372. doi: 10.1097/01.BRS.0000067115.61673.FF.Spine (Phila Pa 1976). 2003.PMID: 12838091Clinical Trial.