1. Department of Cardiology, University Hospital Augsburg, Augsburg, Germany
2. Chair of Epidemiology at the University of Augsburg, University Hospital Augsburg, Augsburg, Germany
3. Department of Cardiology, Hospital of Rosenheim, Rosenheim, Germany
4. Institute for Medical Information Processing, Biometry and Epidemiology- IBE, Ludwig- Maximilians Universität München, Munich, Germany