https://api.elsevier.com/content/article/pii/S0740547221001008doi:10.1016/j.jsat.2021.1083741-s2.0-S074054722100100810.1016/j.jsat.2021.108374S0740-5472(21)00100-8Identifying the impacts of the COVID-19 pandemic on service access for people who use drugs (PWUD): A national qualitative study Journal of Substance Abuse TreatmentJournal074054722021-10-31October 20211trueFullfalseAuthorhttp://creativecommons.org/licenses/by-nc-nd/4.0/