University of Fribourg - Department of Cardiology, Cardiocentro Ticino - Department of Cardiac Surgery, Triemli Hospital Zurich - Department of Cardiology, University Hospital Zurich - University Heart Center, Department of Cardiology, University of Lausanne - Division of Cardiology, Hirslanden Klinik Im Park - Cardiovascular Center Zurich, Cantonal Hospital - Department of Cardiology, Geneva University Hospital - Department of Cardiology, Geneva University Hospital - Department of Cardiology, University of Basel - Department of Cardiology, Geneva University Hospital - Department of Cardiovascular Surgery, University of Bern - Department of Cardiovascular Surgery, University of Bern - Department of Cardiovascular Surgery, University of Bern - CTU Bern, University of Fribourg - Department of Cardiology, University of Fribourg - University Medical Center, University of Bern - CTU Bern, University of Bern - Department of Cardiology, University of Fribourg - Department of Cardiology and University of Bern - Department of Cardiology