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Johnson KA, Keough C, Hills H, Vermeer W, Lengnick-Hall R, McNulty M, McGovern M, Brown H.Johnson KA, et al. Among authors: keough c.Addict Sci Clin Pract. 2021 Jul 30;16(1):49. doi: 10.1186/s13722-021-00258-2.Addict Sci Clin Pract. 2021.PMID: 34330335Free PMC article.