1. Lu L, Shepard JD, Scott Hall F, Shaham Y (2003) Effect of environmental stressors on opiate and psycho-stimulant reinforcement, reinstatement and discrimination in rats: a review. Neuro Sci Biobehav Rev 27:457–491
2. Shaham Y, Shalev U, Lu L, De Wit H, Stewart J (2003) The reinstatement model of drug relapse: history, methodology and major findings. Psychopharmacology 168:3–20
3. Wang J, Fang Q, Liu Z, Lu L (2006) Region-specific effects of brain corticotropin-releasing factor receptor type 1 blockade on foot shock-stress-or drug-priming-induced reinstatement of morphine conditioned place preference in rats. Psychopharmacology 185:19–28
4. Guo M, Wu CF, Wang JH, Pei G (2004) Effects of ginsenosides on the actions of morphine. Zhongguo Zhong Yao Za Zhi 29:299–301
5. Xu T, Jin XL, Cao HM (2001) Pharmacological action of tetra-hydropalmatine: recent progress. Chin J Clin Pharm 10:58–616