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ORIGINAL ARTICLEOptimized procedures for simultaneous quantitation of low concentration levels of morphine and codeine in urine using gas chromatography–mass spectrometryTang Sheng-Hui, Chuang Chien-Huei, Chen Shu-Fen, Chuang Wei-Chen, Shang Hung-ShengYear : 2020| Volume: 40| Issue : 2 | Page no: 68-75