1 Department of Emergency, Anesthesia and Intensive Care, Policlinico Vittorio Emanuele San Marco University Hospital, Catania, Italy, maxsorbello@gmail.com.
2 Department of Anaesthesia, Azienda di Rilievo Nazionale ad Alta Specializzazione - Garibaldi, Catania, Italy.
3 Anesthesia and Intensive Care, Azienda di Rilievo Nazionale ad Alta Specializzazione - Garibaldi, Catania, Italy, (Retired).
4 Anesthesia Intensive Care and Pain Medicine, Department of Medicine, University Campus, Bio-Medico of Rome, Rome, Italy.