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Ellefsen KN, Concheiro M, Pirard S, Gorelick DA, Huestis MA.Ellefsen KN, et al.Drug Test Anal. 2016 Mar-Apr;8(3-4):296-303. doi: 10.1002/dta.1966. Epub 2016 Mar 9.Drug Test Anal. 2016.PMID: 26968560