Abstract

References
1.
Gardner
. Brain Reward Mechanisms. In
Lowinson
J.
.; Substance Abuse. Williams & Wilkins , Baltimore , 1997 .
2.
Kreek
Koob
. Drug and Alcohol Dependence 1998 ; 51 : 21 –27 .
3.
Aronoff
G.M.
, ed. Evaluation and Treatment of Chronic Pain, 2nd Ed Williams & Wilkins , Baltimore 1998 .
