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Bjarnadóttir SG, Flengsrud R.Bjarnadóttir SG, et al. Among authors: flengsrud r.J Chromatogr B Analyt Technol Biomed Life Sci. 2014 Jan 1;944:107-13. doi: 10.1016/j.jchromb.2013.11.004. Epub 2013 Nov 13.J Chromatogr B Analyt Technol Biomed Life Sci. 2014.PMID: 24316520