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Orton DJ, Doucette AA.Orton DJ, et al.J Chromatogr B Analyt Technol Biomed Life Sci. 2013 Mar 15;921-922:75-80. doi: 10.1016/j.jchromb.2013.01.021. Epub 2013 Jan 29.J Chromatogr B Analyt Technol Biomed Life Sci. 2013.PMID: 23435344