@article {9691,
	title = {A meta-analysis of retention in methadone maintenance by dose and dosing strategy},
	journal = {American Journal of Drug and Alcohol Abuse},
	year = {2009},
	pages = {28-33},
	doi = {10.1080/00952990802342899},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/19152203},
	author = {Yan-Ping Bao and Zhi-Min Liu and David H. Epstein and Cun Du and Jie Shi and Lin Lu}
}
