TY - JOUR KW - Adult KW - Drug Contamination KW - Drug Overdose/epidemiology KW - Drug Users/psychology/statistics & numerical data KW - Female KW - Fentanyl KW - Fentanyl/administration & dosage/adverse effects KW - Harm Reduction KW - Heroin KW - Heroin Dependence/complications/epidemiology KW - Heroin/chemistry KW - Humans KW - Interviews as Topic KW - Male KW - Massachusetts/epidemiology KW - Middle Aged KW - Mortality KW - New Hampshire/epidemiology KW - Opioid-Related Disorders/complications/epidemiology KW - Opioids KW - Overdose KW - Qualitative Research KW - Substance Abuse Detection/methods KW - uncertainty KW - United States/epidemiology KW - Young Adult AU - D. Ciccarone AU - J. Ondocsin AU - S. G. Mars A1 - BT - The International journal on drug policy C5 - Opioids & Substance Use CY - Netherlands JF - The International journal on drug policy PB - Elsevier B.V PP - Netherlands PY - 2017 SN - 1873-4758; 0955-3959 SP - 146 EP - 155 EP - T1 - Heroin uncertainties: Exploring users' perceptions of fentanyl-adulterated and -substituted 'heroin' T2 - The International journal on drug policy TI - Heroin uncertainties: Exploring users' perceptions of fentanyl-adulterated and -substituted 'heroin' U1 - Opioids & Substance Use U2 - 28735775 VL - 46 VO - 1873-4758; 0955-3959 Y1 - 2017 ER -