title: Letter: Procedures compared for extracting benzodiazepines in blood.
mesh_terms: D001569:Benzodiazepines / Q000097:blood* / Q000302:isolation & purification; D002606:Charcoal; D002845:Chromatography / Q000379:methods; D002852:Chromatography, Ion Exchange / Q000379:methods; D006801:Humans; D008722:Methods; D012822:Silicon Dioxide
chemical_list: D001569:Benzodiazepines; D002606:Charcoal; D012822:Silicon Dioxide