1. Department of Cardiology, Swiss Cardiovascular Centre Bern, University Hospital, Bern, Switzerland
2. Department of Cardiovascular Surgery, Swiss Cardiovascular Centre Bern, University Hospital, Bern, Switzerland
3. Department of Cardiology, Swiss Cardiovascular Centre Bern, University Hospital, Bern, Switzerland / Clinical Trials Unit, Department of Social and Preventive Medicine, University of Bern, Switzerland