1. Institute for Cardiology and Sports Medicine, German Sports University Cologne, Cologne, Germany
2. Institute for Cardiovascular Research, Schüchtermann-Klinik Bad Rothenfelde, Bad Rothenfelde, Germany
3. Department of Cardiac Surgery, INCCI Haerz-Zenter, Luxembourg, Luxembourg
4. Department of Sports Medicine, University of Wuppertal, Wuppertal, Germany
5. Department of Sports Medicine, University Hospital Tuebingen, Tuebingen, Germany