1. Department of Medical Biotechnologies, Unit of Intensive Care Medicine, University of Siena, Viale Bracci 10, 53100 Siena, Italy
2. Department of Medical Biotechnologies, Unit of Cardiology, University of Siena, Viale Bracci, 53100 Siena, Italy
3. Department of Intensive Care, Erasme University Hospital, Route de Lennik, 800-1070 Brussels, Belgium