@article {9669,
	title = {Serum cortisol secretion during heroin abstinence is elevated only nocturnally},
	journal = {American Journal of Drug and Alcohol Abuse},
	year = {2008},
	pages = {321-328},
	doi = {10.1080/00952990802013664},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/18428074},
	author = {Su-Xia Li and Jing Li and David H. Epstein and Xiang Yang Zhang and Thomas R. Kosten and Lin Lu}
}
