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Liquid chromatography—mass spectrometry with on-line solid-phase extraction by a restricted-access C18 precolumn for direct plasma and urine injection

Restricted-access C18 PrecolumnBiochemistryUrine InjectionLiquid Chromatography—mass SpectrometryMedicineGas ChromatographyMass SpectrometryAnalytical ChemistryLiquid ChromatographyClinical ChemistryPreparative ApplicationChromatographic AnalysisPharmacologyChromatographyDrug Analysis