Reductions in HIV prevalence rates among substance-using men who have sex with men in Los Angeles County, 2008-2011. 

Reback CJ, Fletcher JB (2014). Reductions in HIV prevalence rates among substance-using men who have sex with men in Los Angeles County, 2008-2011. AIDS Education and Prevention. 26(5):459-70.doi: 10.1521/aeap.2014.26.5.459.PMID:25299809.