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Highly sensitive gas chromatographic–tandem mass spectrometric method for the determination of morphine and codeine in serum and urine in the femtomolar range

Therapeutic Drug MonitoringBiochemistryGas ChromatographyMedicineNatural SciencesBioanalysisMass SpectrometryBiological Mass SpectrometryFemtomolar RangeDrug PurityDrug TestAnalytical ChemistryDrug MonitoringClinical ChemistryPharmacologyChromatographyDrug Analysis