1 Unit of Intensive Care, Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Via Alessandro Brambilla, 74, 27100 Pavia PV, Italy.
2 Anesthesia and Intensive Care, Fondazione Policlinico San Matteo Hospital IRCCS, Viale Golgi 19, Pavia 27100, Italy.
3 Department of Internal Medicine/Cardiology, Heart Center Leipzig at the University of Leipzig, Leizpig, Germany.
4 Clinic of Internal Medicine and Cardiology, Heart Center Lahr, Hohbergweg 2, D-77933 Lahr/Schwarzwald, Germany.