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Koch A, Burgschweiger A, Herpel E, Sack FU, Schirmacher P, Szabo GB, Karck M, Schnabel PA.Koch A, et al. Among authors: sack fu.Eur J Cardiothorac Surg. 2007 Oct;32(4):639-43. doi: 10.1016/j.ejcts.2007.06.041. Epub 2007 Aug 6.Eur J Cardiothorac Surg. 2007.PMID: 17689088
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Koch A, Loganathan S, Radovits T, Sack FU, Karck M, Szabó GB.Koch A, et al. Among authors: sack fu.Interact Cardiovasc Thorac Surg. 2010 Feb;10(2):181-4. doi: 10.1510/icvts.2009.213280. Epub 2009 Nov 13.Interact Cardiovasc Thorac Surg. 2010.PMID: 19914924