1 Department of Surgery and Medical Surgical Specialties, Surgical Clinic Unit, University Hospital of Catania, Italy. Electronic address: mdonati@unict.it.
2 Department of Surgery and Medical Surgical Specialties, Surgical Clinic Unit, University Hospital of Catania, Italy.
3 Department of Surgery, Divison of HPB Surgery, Asklepios Hospital Barmbek, Hamburg, Germany; Semmelweiss University Budapest, Asklepios Campus Hamburg, Germany.