1. O.U. of Anesthesia, Intensive Care and Pain Therapy of Sant'Antonio Abate Hospital; Casa Santa Erice Trapani Italy
2. O.U. of Anesthesia, Intensive Care and Pain Therapy of Azienda Ospedaliera Ospedali Riuniti Villa Sofia Cervello; Palermo Italy
3. Anaesthesiology, Intensive Care and Pain Therapy Department; Catholic University; Medical School; Rome Italy
4. Plastic and Reconstructive Surgery Department; University ‘Sapienza’ of Rome; Rome Italy