1. Department of General Surgery and Liver Transplantation, University of Bari, Bari, Italy
2. Section of Surgical Clinic II, Department of Surgical and Oncologic Sciences, University of Padua, Padua, Italy
3. III Surgical Clinic, University of Rome ‘La Sapienza’, Rome, Italy
4. Department of General Thoracic and Vascular Surgery, University Federico II, Naples, Italy