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The Association of Drug-Use Characteristics and Active Coping Styles With Positive Affect in Patients With Heroin-Use Disorder and Methamphetamine-Use Disorder During the COVID-19 Pandemic. 

Wang Y, Zuo J, Wang L, Wang Q, Wang X, Yang Q, Wu HE, Goodman CB, Wang D, Liu T, Zhang X. 

Front Public Health. 2021 Dec 3;9:739068. doi: 10.3389/fpubh.2021.739068. PMID: 34926370; PMCID: PMC8677928.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8677928/