1. Esser MB, Hedden SL, Kanny D, Brewer RD, Gfroerer JC, Naimi TS. Prevalence of alcohol dependence among US adult drinkers, 2009-2011. Prev Chronic Dis 2014; 11 : E206.
2. Substance abuse and mental health services administration. Results from the 2013 national survey on drug use and health: Summary of national findings, NSDUH Series H-48 2015 [ May 11, 2015]; Available from: http://www.samhsa.gov/data/sites/ default/files/NS DUHresultsPDFWHTML2013/Web/NSDUHresults2013.pdf
3. Drug Enforcement Administration national drug threat assessment 2015 [May 11, 2015]; Available from: http://www.d ea.gov/resource-center/DIR-017-13%20NDTA%20Summary%20fi nal.pdf
4. Chen LH, Hedegaard H, Warner M. Drug-poisoning deaths involving opioid analgesics: United States, 1999-2011. NCHS data brief no 166 US Department of Health and Human Services 2014 [May 11, 2015]; Available from: http://www.cdc.gov/nchs/data/databriefs/db166.htm
5. 4. Brauser D. Addiction a brain disease, ASAM says 2015 [May 11, 2015]