1. Volkow N. America’s addiction to opioids: heroin and prescription drug abuse. National Institute on Drug Abuse. 2014. http://www.drugabuse.gov/about-nida/legislative-activities/testimony-to-congress/2014/americas-addiction-to-opioids-heroin-prescription-drug-abuse-_ftn4 . Accessed 27 January 2015
2. Warner M, Hedegaard H, Chen L. Trends in drug-poisoning deaths involving opioid analgesics and heroin: United States, 1999–2012. In: Health E-Stat. Centers for Disease Control and Prevention’s National Vital Statistics System. 2014. http://www.cdc.gov/nchs/data/hestat/drug_poisoning/drug_poisoning.htm . Accessed 27 January 2015
3. Rudd RA, Aleshire N, Zibbell JE, Gladden RM. Increases in drug and opioid overdose deaths—United States, 2000–2014. MMWR morbidity and mortality weekly report. 2016;64(50–51):1378–82. doi: 10.15585/mmwr.mm6450a3
4. Rudd RA, Paulozzi LJ, Bauer MJ, Burleson RW, Carlson RE, Dao D, et al. Increases in heroin overdose deaths—28 States, 2010 to 2012. MMWR Morb Mortal Wkly Rep. 2014;63(39):849–54.
5. Hedegaard H, Chen LH, Warner M. Drug-poisoning deaths involving heroin: United States, 2000–2013. NCHS data brief. 2015(190):1–8