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Simultaneous, quantitative determination of opiates, amphetamines, cocaine and benzoylecgonine in oral fluid by liquid chromatography quadrupole-time-of-flight mass spectrometry

Substance AbusePsychoactive DrugAddictionMedicineDrug PurityOral FluidQuantitative DeterminationDrug TestAnalytical ChemistryPharmacologyPharmacokineticsChromatographyDrug Analysis