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Valen A, Leere Øiestad ÅM, Strand DH, Skari R, Berg T.Valen A, et al.Drug Test Anal. 2017 May;9(5):808-823. doi: 10.1002/dta.2045. Epub 2016 Aug 19.Drug Test Anal. 2017.PMID: 27464485
Valen A, Bogstrand ST, Vindenes V, Frost J, Larsson M, Holtan A, Gjerde H.Valen A, et al.Traffic Inj Prev. 2019;20(5):460-466. doi: 10.1080/15389588.2019.1616700. Epub 2019 Jun 6.Traffic Inj Prev. 2019.PMID: 31169405