1 Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy Vita-Salute San Raffaele University, Milan, Italy.
2 Department of Anesthesia and Intensive Care, IRCCS San Raffaele Scientific Institute, Milan, Italy.
3 Division of Cardiac Anesthesia and Intensive Care Unit, 'Monaldi' Hospital A.O.R.N. 'Dei Colli', Naples, Italy.