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Collins SE, Eck S, Kick E, Schröter M, Torchalla I, Batra A.Collins SE, et al.Addict Behav. 2009 May;34(5):477-80. doi: 10.1016/j.addbeh.2008.12.008. Epub 2008 Dec 24.Addict Behav. 2009.PMID: 19162408
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Collins SE, Eck S, Torchalla I, Schröter M, Batra A.Collins SE, et al.Drug Alcohol Depend. 2010 Sep 1;111(1-2):82-8. doi: 10.1016/j.drugalcdep.2010.03.012. Epub 2010 May 23.Drug Alcohol Depend. 2010.PMID: 20547012Clinical Trial.