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Robinson DE, Ball KE, Webb PJ.Robinson DE, et al. Among authors: ball ke.Spine (Phila Pa 1976). 2001 Mar 15;26(6):E135-8. doi: 10.1097/00007632-200103150-00006.Spine (Phila Pa 1976). 2001.PMID: 11246396
NAKAMURA JT, BALL KE.NAKAMURA JT, et al. Among authors: ball ke.Am Ind Hyg Assoc J. 1964 Jan-Feb;25:77-80. doi: 10.1080/00028896409342558.Am Ind Hyg Assoc J. 1964.PMID: 14110682No abstract available.