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Sandtorv LB, Hysing M, Rognlid M, Nilsen SA, Elgen IB.Sandtorv LB, et al. Among authors: elgen ib.Subst Abuse. 2017 Jun 29;11:1178221817718160. doi: 10.1177/1178221817718160. eCollection 2017.Subst Abuse. 2017.PMID: 29581703Free PMC article.