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Determination of free (unconjugated) amphetamine-type stimulants in urine samples by dispersive liquid–liquid microextraction and gas chromatography coupled to mass spectrometry (DLLME-GC-MS)

Amphetamine-type StimulantsPsychoactive DrugGas ChromatographyMedicineDrug PurityBioanalysisMass SpectrometryDrug TestingDrug TestAnalytical ChemistryUrine SamplesLiquid ChromatographyClinical ChemistryPharmacologyChromatographyDrug Analysis