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Ewert R, Opitz CF, Wensel R, Winkler J, Halank M, Felix SB.Ewert R, et al.Clin Res Cardiol. 2007 Apr;96(4):211-7. doi: 10.1007/s00392-007-0490-3. Epub 2007 Feb 15.Clin Res Cardiol. 2007.PMID: 17294349Clinical Trial.