1. Anesthesiology and Intensive Care Unit, Fondazione IRCCS Policlinico San Matteo , V.le Camillo Golgi, 19 27100 Pavia , Italy
2. Division of Cardiology, Fondazione IRCCS Policlinico S. Matteo , Pavia , Italy
3. Department of Medical, Surgical, Diagnostic and Pediatric Science, University of Pavia , Pavia , Italy