Engin Usta*, Christof Burgstahler, Hermann Aebert, Stephen Schroeder, Uwe Helber, Andreas F Kopp and Gerhard Ziemer
* Corresponding author: Engin Usta engin.usta@med.uni-tuebingen.de
Journal of Cardiothoracic Surgery 2009, 4:43 doi:10.1186/1749-8090-4-43
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