1. Department of Surgery & Medical-Surgical Specialties, General & Oncologic Surgery Unit, Vittorio-Emanuele University Hospital, University of Catania, 95122 Catania, Italy
2. Department of Surgery, Divison of General & Abdominal Surgery, Asklepios Hospital Barmbek, Semmelweis University, Asklepios Campus Hamburg, 20099 Hamburg, Germany
3. Department of Oncology, Asklepios Hospital Barmbek, Semmelweis University, Asklepios Campus Hamburg, 20099 Hamburg, Germany