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Kaczorowska MA, Cooper HJ.Kaczorowska MA, et al.J Am Soc Mass Spectrom. 2009 Dec;20(12):2238-47. doi: 10.1016/j.jasms.2009.08.012. Epub 2009 Aug 27.J Am Soc Mass Spectrom. 2009.PMID: 19786355Free article.