1. Heart Surgery Unit, Cardiocentro Ticino Institute, EOC, 6900 Lugano, Switzerland
2. Cardiology Unit, Cardiocentro Ticino Institute, EOC, 6900 Lugano, Switzerland
3. Faculty of Biomedical Sciences, Università della Svizzera Italiana (USI), 6900 Lugano, Switzerland
4. Faculty of Medicine, University of Zurich (UZH), 8032 Zurich, Switzerland
5. Faculty of Medicine, University of Bern, 3010 Bern, Switzerland