[Serum morphine concentration following its epidural administration--quantitative determination of morphine in serum by high performance liquid chromatography using an ultraviolet detector].
D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation; D006801:Humans; D007268:Injections, Epidural; D009020:Morphine / Q000008:administration & dosage / Q000097:blood*
D009020:Morphine