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Fritz JM, Piva SR.Fritz JM, et al. Among authors: piva sr.Spine (Phila Pa 1976). 2003 Jun 1;28(11):1189-94. doi: 10.1097/01.BRS.0000067270.50897.DB.Spine (Phila Pa 1976). 2003.PMID: 12782991Clinical Trial.