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Stockman L, Clark KA, Hunt JM, Roberts GD.Stockman L, et al. Among authors: roberts gd.J Clin Microbiol. 1993 Apr;31(4):845-50. doi: 10.1128/jcm.31.4.845-850.1993.J Clin Microbiol. 1993.PMID: 8463395Free PMC article.