RT Journal Article SR Electronic T1 Mass Spectrometry of Drugs in Body Fluids JF Drug Metabolism and Disposition JO Drug Metab Dispos FD American Society for Pharmacology and Experimental Therapeutics SP 654 OP 655 VO 1 IS 4 A1 K. C. L. YR 1973 UL http://dmd.aspetjournals.org/content/1/4/654.1.abstract AB