1 Department of Anesthesia, Intensive Care, and Out-Hospital Emergency, Ospedale Regionale della Valle d'Aosta, Aosta, Italy. Electronic address: edelfino@ausl.vda.it.
2 Department of Anesthesia, Intensive Care, and Out-Hospital Emergency, Ospedale Regionale della Valle d'Aosta, Aosta, Italy.
3 Department of Anesthesia and Intensive Care, IRCCS Sacro Cuore Don Calabria, Negrar di Valpolicella, Verona, Italy.