1. Department of Intensive Care Anesthesia and Trauma Division, Cesena, Italy
2. Department of Anesthesia and Intensive Care, University of Pisa, Pisa, Italy
3. Department of Surgery, University of Pisa, Pisa, Italy
4. Department of Surgery, Bufalini Hospital, Cesena, Italy
5. Department of Cardio-Thoracic Surgery, Policlinico S. Orsola Malpighi University Hospital, Bologna, Italy
6. Department of Hepato-Pancreato-Biliary Surgery and Liver Transplantation Unit, University of Modena and Reggio Emilia, Modena, Italy
7. Department of Organ Insufficiency and Transplantation, General Surgery and Transplantation, University Hospital of Bologna, Policlinico S. Orsola-Malpighi, Bologna, Italy