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de Castro A, Concheiro M, Shakleya DM, Huestis MA. Simultaneous Quantification of Methadone, Cocaine, Opiates, and Metabolites in Human Placenta by Liquid Chromatography-Mass Spectrometry. Journal of Analytical Toxicology. 2009 Jun 01;33(5):243–52. doi: 10.1093/jat/33.5.243. |