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Knapp DR Jr, Price CT, Jones ET, Coonrad RW, Flynn JC.Knapp DR Jr, et al. Among authors: flynn jc.Spine (Phila Pa 1976). 1992 Oct;17(10):1159-65. doi: 10.1097/00007632-199210000-00006.Spine (Phila Pa 1976). 1992.PMID: 1440004