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Elian AA, Hackett J.Elian AA, et al.J Chromatogr B Analyt Technol Biomed Life Sci. 2011 Dec 1;879(31):3752-8. doi: 10.1016/j.jchromb.2011.09.018. Epub 2011 Oct 8.J Chromatogr B Analyt Technol Biomed Life Sci. 2011.PMID: 22055831