Piotr Knapik*, Daniel Ciesla, Dawid Borowik, Piotr Czempik and Tomasz Knapik
* Corresponding author: Piotr Knapik pknapik@sum.edu.pl
Journal of Cardiothoracic Surgery 2011, 6:158 doi:10.1186/1749-8090-6-158
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