WHO. 2005c. WHO Model List of Essential Medicine. 14th edition. [Online]. Available: http://whqlibdoc.who.int/hq/2005/a87017_eng.pdf [accessed August 11, 2006].
WHO. 2005d. Policy Brief: Antiretroviral Therapy and Injecting Drug Users. Geneva, Switzerland: WHO.
WHO, UNODC, UNAIDS. 2004. Substitution Maintenance Therapy in the Management of Opioid Dependence and HIV/AIDS Prevention: Position Paper. Geneva, Switzerland: WHO.
Wood E, Kerr T, Small W, Jones J, Schechter M, Tyndall M. 2003. The impact of a police presence on access to needle exchange programs. Journal of Acquired Immune Deficiency Syndromes. 34(1):116–118.
Yu XF, Chen J, Scao Y, Beyrer C, Liu B, Wang Z, Liu W, Yang J, Liang S, Viscidi RP, Gu J, Gurrie-Glass, G, Lai S. 1999. Emerging HIV infections with distinct subtypes of HIV-1 infection among injection drug users from geographically separate locations in Guangxi Province, China. Journal of Acquired Immune Deficiency Syndromes. 22(2):180–188.
Zamani S, Kihara M, Gouya MM, Vazirian M, Nassirimanesh B, Ono-Kihara M, Ravari SM, Safaie A, Ichikawa S. 2006. High prevalence of HIV infection associated with incarceration among community-based injecting drug users in Tehran, Iran. Journal of Acquired Immune Deficiency Syndromes. 42(3):342–346.
Zhao M, Du J, Lu GH, Wang QU, Xu H, Zhu M, McCoy CB. 2006. HIV sexual risk behaviors among injection drug users in Shanghai. Drug Alcohol Dependence. 82(Suppl 1):S43–S47.
Zweben JE, Cohen JB, Christian D, Galloway GP, Salinardi M, Parent D, Iguchi M, Methamphetamine Treatment Project. 2004. Psychiatric symptoms in methamphetamine users. American Journal of Addiction. 13(2):181–190.