**Author details**

Norbert W. Guldner1 , Peter Klapproth2 , Hangörg Zimmermann3 and Hans- H. Sievers1

\*Address all correspondence to: Guldner@uni-luebeck.de

1 Clinic of Cardiac Surgery, University of Lübeck, Germany

2 Microstim GmbH, Wismar, Germany

3 Pfm Titan GmbH Nürnberg, Hangörg Zimmermann, Germany
