1. Hepato-Pancreato-Biliary (HPB) Surgical Unit, Royal Surrey NHS Foundation Trust, Guildford, Surrey, UK
2. General Surgery Unit, University “Magna Graecia” of Catanzaro, Catanzaro, Italy
3. Department of General, Visceral, and Thoracic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
4. Section of Oncology, Deptartment of Clinical & Experimental Medicine, FHMS, University of Surrey, Guildford, Surrey, UK