Development and validation of a liquid chromatography mass spectrometry assay for the simultaneous quantification of methadone, cocaine, opiates and metabolites in human umbilical cord.

de Castro A, Concheiro M, Shakleya DM, Huestis MA. Development and validation of a liquid chromatography mass spectrometry assay for the simultaneous quantification of methadone, cocaine, opiates and metabolites in human umbilical cord. J Chromatogr B Analyt Technol Biomed Life Sci. 2009 Oct 01; 877(27):3065-71.

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