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McGinnis KA, Skanderson M, Edelman EJ, Gordon AJ, Korthuis PT, Oldfield B, Williams EC, Wyse J, Bryant K, Fiellin DA, Justice AC, Kraemer KL.McGinnis KA, et al. Among authors: williams ec.Drug Alcohol Depend. 2020 Dec 1;217:108272. doi: 10.1016/j.drugalcdep.2020.108272. Epub 2020 Sep 11.Drug Alcohol Depend. 2020.PMID: 32971391Free PMC article.
Bryson CL, Au DH, Sun H, Williams EC, Kivlahan DR, Bradley KA.Bryson CL, et al. Among authors: williams ec.Ann Intern Med. 2008 Dec 2;149(11):795-804. doi: 10.7326/0003-4819-149-11-200812020-00004.Ann Intern Med. 2008.PMID: 19047026Free article.Clinical Trial.