1. National Center for Health Statistics, Vital statistics rapid release. Provisional drug overdose death counts, Atlanta, GA: Centers for Disease Control and Prevention, 2018. https://www.cdc.gov/nchs/nvss/vsrr/drug-overdose-data.htm.
2. J.K. O’Donnell, J. Halpin, C.I. Mattson, B.A. Goldberger, R.M. Gladden. Deaths involving fentanyl, fentanyl analogs, and u-47700-10 states, July-December 2016, Morbidity and Mortality Weekly Report (MMWR), 2017, 66, 1197-1202. DOI:10.15585/mmwr.mm6643e1.
3. Drug Enforcement Administration, NFLIS. https://www.nflis.deadiversion.usdoj.gov, 2019.
4. Drug Enforcement Administration. 2018 Synth-Opioids Report. Drug Enforcement Administration, 2018, Southeast Laboratory.
5. The opioid epidemic: moving toward an integrated, holistic analytical response;Morrow;J. Anal. Toxicol.,2018