1 Department of Cardiac Surgery, IRCCS San Raffaele Hospital "Vita-Salute" San Raffaele University, Via Olgettina 60, Milan, 20132 Italy. Electronic address: lapenna.elisabetta@hsr.it.
2 Department of Cardiac Surgery, IRCCS San Raffaele Hospital "Vita-Salute" San Raffaele University, Via Olgettina 60, Milan, 20132 Italy.