1 Anaesthesia and Intensive Care, AOU Policlinico Vittorio Emanuele, Catania, Italy.
2 Department of Anaesthesia and Reanimation, Clinical Hospital Center "Zvezdara" Belgrade, Serbia.
3 Unit of Anesthesia, Intensive Care and Pain Management, Department of Medicine, Campus Bio-Medico University, Rome, Italy.
4 Anaesthesia, Polyvalent Intensive Care and Transplantation Unit, Department of Organ Failure and Transplantation, S. Orsola-Malpighi Hospital, Bologna, Italy.