1. Faculty of Medicine and Surgery, University of Enna “Kore”, 94100 Enna, Italy
2. Anesthesia and Intensive Care Department, Policlinico “G.Rodolico—San Marco” Hospital, 95123 Catania, Italy
3. Gynecology and Obstetrics Department, Giovanni Paolo II Hospital, ASP 7, 97100 Ragusa, Italy