JournalofChromatographyB,804(2004)421–429Simultaneousdeterminationofdexamethasoneand6 -hydroxydexamethasoneinurineusingsolid-phaseextractionandliquidchromatography:applicationstoinvivomeasurementofcytochromeP4503A4activityK.Zurbonsena,F.Bressollea,b,∗,I.Solassola,P.J.Aragonc,S.Culined,F.PinguetaaOnco-pharmac...