1. Cardiology, Zürcher RehaZentrum Wald, Wald, Switzerland
2. University Heart Centre, Department of Cardiology, University Hospital Zurich, Switzerland
3. AMIS Plus Data Centre, Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Switzerland
4. Department of Cardiology, Kantonsspital St Gallen, St. Gallen, Switzerland