Heroin or fentanyl: Prevalence of confirmed fentanyl in ED patients with suspected heroin overdose oleh Siri Shastry, Jonathan Lin, Kim Aldy, Jeffrey Brent, Paul Wax, Alex Krotulski, Sharan Campleman, Shao Li, Alison Meyn, Stephanie Abston, Barry Logan, Alexandra Amaducci, Bryan Judge, Michael Levine, Diane Calello, Joshua Shulman, Adrienne Hughes, Rachel Culbreth, Evan Schwarz, Alex F. Manini, the Toxicology Investigators Consortium Fentalog Study Group