Prachand Nikhil G, Benbow Nanette
STD/HIV/AIDS Division, Surveillance, Epidemiology and Research Section, Chicago Department of Public Health, Chicago, IL, USA.
Int J Drug Policy. 2008 Jun;19(3):244-5; discussion 246-7. doi: 10.1016/j.drugpo.2008.03.005. Epub 2008 Apr 29.