Validation of a liquid chromatography-mass spectrometric assay for tacrolimus in liver biopsies after hepatic transplantation: correlation with histopathologic staging of rejection., Capron, Arnaud, Lerut Jan, Verbaandert Catherine, Mathys Jules, Ciccarelli Olga, Vanbinst Roger, Roggen Francine, De Reyck Chantal, Lemaire Julien, and Wallemacq Pierre E. , Ther Drug Monit, 2007 Jun, Volume 29, Issue 3, (2007)