@article{article42d01758,
title   = {Enantioselective analysis of unbound tramadol, O-desmethyltramadol and N-desmethyltramadol in plasma by ultrafiltration and LC-MS/MS: application to clinical pharmacokinetics},
author = {Moraes, Natália Valadares de and Lauretti, Gabriela Rocha and Napolitano, Marcio Nogueira and Santos, Naiane Ribeiro and Godoy, Ana Leonor Pardo Campos and Lanchote, Vera Lúcia},
year = {2012},
doi = {10.1016/j.jchromb.2011.11.033},
journal   = {Journal of Chromatography B}
}