1 Department of Surgery, Anesthesia and Intensive Care Section "G.B. Morgagni-Pierantoni" Hospital, Forlì, Italy. Electronic address: drpiraccini@gmail.com.
2 Department of Anesthesia and Intensive Care "Ingrassia"Hospital, Palermo, Italy.
3 Department of Surgery, Anesthesia and Intensive Care Section "G.B. Morgagni-Pierantoni" Hospital, Forlì, Italy.