1. Centers for Disease Control and Prevention. Epidemiology of HIV infection through 2011. Accessed at http://www.cdc.gov/hiv/pdf/statistics_surveillance_Epi-HIV-infection.pdf.
2. Monitoring selected national HIV prevention and care objectives by using HIV surveillance data—United States and 6 US dependent areas—2010;Centers for Disease Control and Prevention;HIV AIDS Surveill Rep.,2012
3. HIV prevention bulletin: medical advice for persons who inject illicit drugs;US Public Health Service,1997
4. Des Jarlais DC, Guardino V, Nugent A et al. 2011 National Survey of Syringe Exchange Programs: Summary of Results. Accessed at http://www.nasen.org/news/2012/nov/29/2011-bethisrael-survey-results-summary/.
5. HIV prevention, treatment, and care services for people who inject drugs: A systematic review of global, regional, and national coverage;Mathers;Lancet,2010