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Quantitative analysis of multiple illicit drugs in preserved oral fluid by solid-phase extraction and liquid chromatography–tandem mass spectrometry

Substance AbusePreserved Oral FluidMedicineDrug PurityQuantitative AnalysisMass SpectrometryMultiple Illicit DrugsDrug TestAnalytical ChemistryLiquid ChromatographyClinical ChemistryChromatographic AnalysisPharmacologyChromatographyDrug Analysis