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Hurwitz EL, Aker PD, Adams AH, Meeker WC, Shekelle PG.Hurwitz EL, et al.Spine (Phila Pa 1976). 1996 Aug 1;21(15):1746-59; discussion 1759-60. doi: 10.1097/00007632-199608010-00007.Spine (Phila Pa 1976). 1996.PMID: 8855459Review.