1. Department of Cardiac Surgery, HELIOS Clinic for Cardiac Surgery Karlsruhe, Karlsruhe, Germany
2. Department of Cardiology, Medical Clinic IV, Municipal Hospital Karlsruhe, Karlsruhe, Germany
3. Department of Cardiology, Intensive Care Medicine and Angiology, Vincentius-Diakonissen Hospital Karlsruhe, Karlsruhe, Germany