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Schellhas KP, Smith MD, Gundry CR, Pollei SR.Schellhas KP, et al. Among authors: gundry cr.Spine (Phila Pa 1976). 1996 Feb 1;21(3):300-11; discussion 311-2. doi: 10.1097/00007632-199602010-00009.Spine (Phila Pa 1976). 1996.PMID: 8742205