1. Department of Anesthesia and Intensive Care, Azienda Ospedaliera Universitaria Policlinico “G. Rodolico-San Marco”, 95123 Catania, Italy
2. Department of Thoracic Surgery, Azienda Ospedaliera Universitaria Policlinico “G. Rodolico-San Marco”, 95123 Catania, Italy
3. Faculty of Medicine and Surgery, University “Kore”, 94100 Enna, Italy
4. Department of General Surgery and Medical-Surgical Specialties, University of Catania, 95123 Catania, Italy