1 Department of Surgical, Oncological and Oral Science (Di.Chir.On.S.), Section of Anesthesia, Analgesia, Intensive Care and Emergency, Policlinico Paolo Giaccone, University of Palermo, Italy. Electronic address: andrea.cortegiani@unipa.it.
2 Anesthesia and Intensive Care, Department of Medical and Surgical Sciences, Magna Graecia University, Catanzaro, Italy.
3 Anesthesia and Intensive Care, AOU Policlinico Vittorio Emanuele, Catania, Italy.