1. Connock M, Juarez-Garcia A, Jowett S, Frew E, Liu Z, Taylor RJ, et al. Methadone and buprenorphine for the management of opioid dependence: a systematic review and economic evaluation. Health Technol Assess. 2007;11:1–171.
2. United Nations World Drug Report. Recent statistics and trend analysis of illicit drug market. 2012. https://www.unodc.org/documents/data-and-analysis/WDR2012/WDR_2012_Chapter1.pdf . Accessed 23 Jun 2015.
3. Ross J, Teesson M, Darke S, Lynskey M, Ali R, Ritter A, et al. The characteristics of heroin users entering treatment: findings from the Australian treatment outcome study (ATOS). Drug Alcohol Rev. 2005;24:411–8.
4. World Health Organization. Guidelines for the psychosocially assisted pharmacological treatment of opioid dependence. 2009. http://www.who.int/substance_abuse/publications/opioid_dependence_guidelines.pdf . Accessed 28 May 2015.
5. Doran C. Economic evaluation of interventions for illicit opioid dependence: a review of evidence. 2007. http://www.who.int/substance_abuse/activities/economic_evaluation_interventions.pdf . Accessed 18 Nov 2015.