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Gruß I, Firemark A, Mayhew M, McMullen CK, DeBar LL.Gruß I, et al. Among authors: debar ll.Int J Drug Policy. 2019 Dec;74:62-68. doi: 10.1016/j.drugpo.2019.08.009. Epub 2019 Sep 16.Int J Drug Policy. 2019.PMID: 31536957Free PMC article.Clinical Trial.