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Clark BC, Manini TM, Ploutz-Snyder LL.Clark BC, et al.Spine (Phila Pa 1976). 2003 Feb 1;28(3):282-7. doi: 10.1097/01.BRS.0000042227.06526.A2.Spine (Phila Pa 1976). 2003.PMID: 12567032Clinical Trial.