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Cleland JG, Erhardt L, Murray G, Hall AS, Ball SG.Cleland JG, et al. Among authors: hall as.Eur Heart J. 1997 Jan;18(1):41-51.Eur Heart J. 1997.PMID: 9049514Clinical Trial.
Ball SG, Hall AS, Murray GD.Ball SG, et al. Among authors: hall as.Eur Heart J. 1994 May;15 Suppl B:20-5; discussion 26-30. doi: 10.1093/eurheartj/15.suppl_b.20.Eur Heart J. 1994.PMID: 8076659Clinical Trial.