1. Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Freiburgstrasse, Bern, Switzerland
2. Institute of Social and Preventive Medicine and Clinical Trials Unit, University of Bern, Mittelstrasse 43, Bern, Switzerland
3. Department of Cardiovascular Surgery, Inselspital, Bern University Hospital, University of Bern, Freiburgstrasse, Bern, Switzerland