United Nations Programme on
HIV/AIDS (UNAIDS), World Health Organization (WHO) (2009). AIDS Epidemic Update: December 2009. Available online:
U.S. Centers for Disease Control and Prevention (2008). HIV prevalence estimates—United States, 2006. MMWR, 57(39): 1073–1076.
Centers for Disease Control and Prevention (2008). HIV transmission rates in the United States—CDC Fact Sheet. Available online: http://www.cdc.gov/hiv/topics/surveillance/resources/factsheets/pdf/transmission.pdf.