1. Worldwide prevalence and trends in unintentional drug overdose: a systematic review of the literature;Martins;Am J Public Health,2015
2. European Monitoring Centre for Drugs and Drug Addiction (2015) European drug report 2015: trends and developments (Publications Office of the European Union, Luxembourg) http://www.emcdda.europa.eu/publications/edr/trends-developments/2015 (accessed 18 Jan 2017).
3. European Monitoring Centre for Drugs and Drug Addiction (2013) European drug report 2013: trends and developments (Publications Office of the European Union, Luxembourg) http://www.emcdda.europa.eu/attachements.cfm/att_213154_EN_TDAT13001ENN1.pdf (accesed 18 Jan 2017).
4. Farrell M Barry J (2010) The introduction of the opioid treatment protocol (Health Service Executive, Dublin) http://www.drugsandalcohol.ie/14458/1/Opioid_Treatment_Protocol%5B1%5D.pdf (accessed 18 Jan 2017).
5. A chronic care service that actually works;Hunter;Forum,2015