- 4th Wave in U.S. Overdose Crisis: 50x Surge in Deaths From Fentanyl Laced Stimulants SciTechDaily
- How the fentanyl crisis’ fourth wave has hit every corner of the US BBC
- Stimulants may be driving a “fourth wave” of the overdose crisis, with deaths at an all-time high Salon
- Overdose Deaths from Fentanyl Mixed with Stimulants Have Increased: Study PEOPLE
- ‘Fourth wave’ of crisis devastates US news.com.au
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