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The direct barbituric acid assay for nicotine metabolites in urine: A simple colorimetric test for the routine assessment of smoking status and cigarette smoke intake

Tobacco ControlSmoking StatusHealth SciencesTobacco UseAddictionMedicineBioanalysisPhysiologyNicotineDrug TestToxicologyClinical ChemistryMetabolomicsCigarette Smoke IntakeNicotine Metabolites