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Rad M, Hümpel M, Schaefer O, Schoemaker RC, Schleuning WD, Cohen AF, Burggraaf J.Rad M, et al. Among authors: humpel m.Br J Clin Pharmacol. 2006 Sep;62(3):288-96. doi: 10.1111/j.1365-2125.2006.02656.x.Br J Clin Pharmacol. 2006.PMID: 16934044Free PMC article.Clinical Trial.