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Kramer KM, Küper MA, Zdichavsky M, Königsrainer A, Glatzle J.Kramer KM, et al. Among authors: kuper ma.Zentralbl Chir. 2009 Feb;134(1):21-3. doi: 10.1055/s-0028-1098808. Epub 2009 Feb 25.Zentralbl Chir. 2009.PMID: 19242878German.