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Seip KF, Gjelstad A, Pedersen-Bjergaard S.Seip KF, et al.J Chromatogr A. 2013 Sep 20;1308:37-44. doi: 10.1016/j.chroma.2013.07.105. Epub 2013 Aug 6.J Chromatogr A. 2013.PMID: 23953612