Heroin or fentanyl: Prevalence of confirmed fentanyl in ED patients with suspected heroin overdose.

Shastry S, Lin J, Aldy K, Brent J, Wax P, Krotulski A, Campleman S, Li S, Meyn A, Abston S, Logan B, Amaducci A, Judge B, Levine M, Calello D, Shulman J, Hughes A, Culbreth R, Schwarz E, Manini AF; Toxicology Investigators Consortium Fentalog Study Group.

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