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Direct injection liquid chromatography/positive ion electrospray ionization mass spectrometric quantification of methotrexate, folinic acid, folic acid and ondansetron in human serum

BiochemistryGas ChromatographyMedicineBioanalysisMass SpectrometryFolinic AcidLaboratory MedicineAnalytical ChemistryLiquid ChromatographyClinical ChemistryHuman SerumFolic AcidPharmacologyChromatographic AnalysisChromatographyDrug Analysis