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Klitgaard A, Iversen A, Andersen MR, Larsen TO, Frisvad JC, Nielsen KF.Klitgaard A, et al. Among authors: nielsen kf.Anal Bioanal Chem. 2014 Mar;406(7):1933-43. doi: 10.1007/s00216-013-7582-x. Epub 2014 Jan 18.Anal Bioanal Chem. 2014.PMID: 24442010Free PMC article.