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Hegstad S, Havnen H, Helland A, Spigset O, Frost J.Hegstad S, et al. Among authors: frost j.J Chromatogr B Analyt Technol Biomed Life Sci. 2018 Mar 1;1077-1078:7-12. doi: 10.1016/j.jchromb.2018.01.028. Epub 2018 Feb 3.J Chromatogr B Analyt Technol Biomed Life Sci. 2018.PMID: 29413579