@article {9678,
	title = {Diurnal variation in cue-induced responses among protracted abstinent heroin users},
	journal = {Pharmacology Biochemistry and Behavior},
	year = {2009},
	pages = {468-472},
	doi = {10.1016/j.pbb.2008.08.023},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/18809427},
	author = {Zhen-Yu Ren and Xiao-Li Zhang and Yu Liu and Li-Yan Zhao and Jie Shi and Yanping Bao and Xiang Yang Zhang and Thomas R. Kosten and Lin Lu}
}
