1. Department of Cardiothoracic Surgery, University of Liège, CHU du Sart-Tilman, 4000 Liège, Belgium.
2. Department of Intensive Care, University of Liège, CHU du Sart-Tilman, 4000 Liège, Belgium.
3. Department of Cardiology, University of Liège, CHU du Sart-Tilman, 4000 Liège, Belgium.