1. Impact of the COVID-19 Pandemic on Opioid Overdose Deaths: a Spatiotemporal Analysis;Ghose R;Journal of Urban Health: Bulletin of the New York Academy of Medicine,2022
2. Spencer, M., et al. (2023). Vital statistics rapid release – Centers for Disease Control and Prevention. Accessed 28 Oct 2023, from https://www.cdc.gov/nchs/data/vsrr/vsrr030.pdf.
3. Centers for Disease Control and Prevention. (2023, September 6). Fentanyl facts. Accessed 4 Dec 2023, from https://www.cdc.gov/stopoverdose/fentanyl/index.html#:~:text=Fentanyl%20is%20a%20synthetic%20opioid,nonfatal%20overdoses%20in%20the%20U.S.&text=There%20are%20two%20types%20of,Both%20are%20considered%20synthetic%20opioids.
4. Abuse of fentanyl: An emerging problem to face;Kuczyńska K;Forensic Science International,2018
5. National Institutes on Drug Abuse. (2021b). Fentanyl. Accessed 15 Nov 2023, from https://nida.nih.gov/research-topics/fentanyl.