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Myerson SG, Montgomery HE, Whittingham M, Jubb M, World MJ, Humphries SE, Pennell DJ.Myerson SG, et al. Among authors: pennell dj.Circulation. 2001 Jan 16;103(2):226-30. doi: 10.1161/01.cir.103.2.226.Circulation. 2001.PMID: 11208681Clinical Trial.