Validation of a method for simultaneous analysis of cocaine, benzoylecognine and cocaethylene in urine using gas chromatography-mass spectrometry by Vinicius Stela Menotti, Deborah Thais Palma Scanferla, Kleber Ota de Oliveira, Gabriela Felber Fratucci, Gessé de Souza Alves, Erika Bando, Samuel Botião Nerilo, Magda Lúcia Félix de Oliveira, Miguel Machinski Junior, Simone Aparecida Galerani Mossini

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