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Koster A, Fischer T, Gruendel M, Mappes A, Kuebler WM, Bauer M, Kuppe H.Koster A, et al. Among authors: kuebler wm.J Cardiothorac Vasc Anesth. 2003 Apr;17(2):171-5. doi: 10.1053/jcan.2003.42.J Cardiothorac Vasc Anesth. 2003.PMID: 12698397Clinical Trial.