Published on in Vol 11, No 2 (2009): Apr-Jun
This is a member publication of University of Maryland, Public Health Informatics Research Laboratory, College Park, MD, USA
1 Department of Public and Community Health Public Health Informatics Research Laboratory, School of Public Health, University of Maryland, College Park, United States
2 School of Public Health, Office of the Dean, University of Maryland, College Park, United States
3 Center for Substance Abuse Research, University of Maryland, College PArk, United States
4 University of Maryland School of Medicine, Baltimore, United States
*all authors contributed equally