RT Journal Article SR Electronic T1 Opioids, Reward and Addiction: An Encounter of Biology, Psychology, and Medicine JF Pharmacological Reviews JO Pharmacol Rev FD American Society for Pharmacology and Experimental Therapeutics SP 341 OP 396 VO 51 IS 2 A1 Jan M. van Ree A1 Mirjam A. F. M. Gerrits A1 Louk J. M. J. Vanderschuren YR 1999 UL http://pharmrev.aspetjournals.org/content/51/2/341.abstract AB