1. Research Group Exercise Epidemiology, German Sport University Cologne, 50933 Cologne, Germany
2. Faculty of Computer Science, University Koblenz, 56070 Koblenz, Germany
3. Department X-Anesthesia, Bundeswehr Central Hospital Koblenz, 56072 Koblenz, Germany
4. Institute of Exercise Training and Sport Informatics, German Sport University Cologne, 50933 Cologne, Germany
5. Faculty of Medicine, University Mainz, 55131 Mainz, Germany