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Wohlfarth A, Toepfner N, Hermanns-Clausen M, Auwärter V.Wohlfarth A, et al.Anal Bioanal Chem. 2011 May;400(3):737-46. doi: 10.1007/s00216-011-4831-8. Epub 2011 Mar 12.Anal Bioanal Chem. 2011.PMID: 21394453