1. Department of Cardiology, Lausanne University Hospital, Lausanne, Switzerland
2. Department of Cardiovascular Surgery, Valais Hospital, Sion, Switzerland
3. Department of Cardiovascular Surgery, Cardiocentro Ticino, Lugano, Switzerland
4. Department of Cardiovascular Surgery, Lausanne University Hospital, Lausanne, Switzerland
5. Department of Anesthesiology, Lausanne University Hospital, Lausanne, Switzerland