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web.archive.org
Fentanyl. Image 4 of 17. US DEA (Drug Enforcement Administration). See archive with caption: "photo illustration of 2 milligrams of fentanyl, a lethal dose in most people".
Opioids (angle). National Institute on Drug Abuse. Arkivita el la originalo je July 26, 2019. Alirita July 29, 2019 .