Olivier Wigger1, Stefan Stortecky2, Henriette Most3, Lars Englberger3. 1. Department of Cardiology, Swiss Cardiovascular Center Bern, Bern University Hospital, Bern 3010, Switzerland. 2. Department of Cardiology, Swiss Cardiovascular Center Bern, Bern University Hospital, Bern 3010, Switzerland stefan.stortecky@insel.ch. 3. Department of Cardiovascular Surgery, Swiss Cardiovascular Center Bern, Bern University Hospital, Bern, Switzerland.