1. Warner M, Hedegaard H, Chen L. Trends in Drug-poisoning Deaths Involving Opioid Analgesics and Heroin: United States, 1999–2012. NCHS Health E-Stat. Available at: http://www.cdc.gov/nchs/data/hestat/drug_poisoning/drug_poisoning_deaths_1999-2012.pdf. Published December 2014. Accessed August 1, 2015.
2. Hedegaard H, Chen L, Warner M. Drug-Poisoning Deaths Involving Heroin: United States, 2000–2013. NCHS Data Brief, no 190. Available at: http://www.cdc.gov/nchs/data/databriefs/db190.pdf. Published 2015. Accessed August 1, 2015.
3. Accidental Poisoning Mortality Among Patients in the Department of Veterans Affairs Health System