1. Warner M, Hui L, Makuc DL, Anderson RN et al (2011) Drug poisoning deaths in the United States, 1980–2008. NCHS data brief no 81. National Center for Health Statistics, Hyattsville
2. Wheeler E, Davidson PJ, Jones S et al (2012) Community-based opioid overdose prevention programs providing naloxone-United States, 2010. MMWR 61(06):101–5
3. Jones CM, Mack KA, Paulozzi LJ (2013) Pharmaceutical overdose deaths, United Sates 2010. JAMA 309:657–9
4. Heroin-related deaths in the US. Blog for the National Center for Health Statistics http://nchstats.com/2014/02/05/heroin-related-deaths-in-the-us/ . Accessed April 11 2014.
5. Maryland Department of Health and Mental Hygiene http://dhmh.maryland.gov/newsroom1/Pages/DHMH-Warns-of-Potent-and-Deadly-Drug-Combination.aspx Accessed April 2014.