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Simultaneous quantification of methamphetamine, cocaine, codeine, and metabolites in skin by positive chemical ionization gas chromatography–mass spectrometry

Gas ChromatographyMedicineDrug PurityForensic ToxicologyMass SpectrometryDrug TestAnalytical ChemistryForensic ChemistryDermatologyMetabolomicsPharmacologyChromatographySimultaneous QuantificationDrug Analysis