1. Department of Cardiology, Pulmonology and Vascular Medicine, Medical Faculty, University Hospital Duesseldorf, Heinrich-Heine University Duesseldorf , Moorenstraße 5, 40225 Duesseldorf , Germany
2. Department of Cardiac Surgery, Medical Faculty, University Hospital Aachen , Pauwelsstraße 30, 52074 Aachen , Germany
3. Cardiovascular Research Institute Duesseldorf, Medical Faculty, Heinrich-Heine University , Moorenstraße 5, 40225 Duesseldorf , Germany
4. Abiomed Europe GmbH , Neuenhofer Weg 3, 52074 Aachen , Germany