RT Journal Article SR Electronic T1 Absorption of 14C-labeled methadone by portal and extraportal venous circulations following intraperitoneal and intraduodenal administration. JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 145 OP 150 VO 211 IS 1 A1 Florence, J E A1 Peters, M A YR 1979 UL http://jpet.aspetjournals.org/content/211/1/145.abstract AB