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Wilson AM, Clark DJ, Devlin MM, McFarlane LC, Lipworth BJ.Wilson AM, et al. Among authors: clark dj.Eur J Clin Pharmacol. 1998 Jan;53(5):317-20. doi: 10.1007/s002280050385.Eur J Clin Pharmacol. 1998.PMID: 9516029Clinical Trial.