1. CDC. drug overdose deaths. (2021). Accessed: June 10, 2021: http://www.cdc.gov/drugoverdose/data/statedeaths.html.
2. CDC. heroin overdose data. (2021). Accessed: June 10, 2021: http://www.cdc.gov/drugoverdose/data/heroin/index.html.
3. CDC. new data show growing complexity of drug overdose deaths in America. (2018). Accessed: June 10, 2021: https://www.cdc.gov/media/releases/2018/p1221-complexity-drug-overdose.html.
4. CDC. understanding the epidemic.. (2021). Accessed: June 10, 2021: http://www.cdc.gov/drugoverdose/epidemic/index.html.
5. DEA. fentanyl. (2018). Accessed: June 10, 2021: http://www.dea.gov/factsheets/fentanyl.