1. Department of Anesthesia and Critical Care, Ospedale S. Gerardo Monza, Monza, Università degli Studi Milano-Bicocca - Italy
2. Department of Cardiology, Ospedale S. Gerardo Monza, Monza - Italy
3. Department of Cardiac Surgery, Ospedali Riuniti, Bergamo - Italy
4. Department of Anesthesia and Critical Care, University of Milano, Milano - Italy