1. Department of General Surgery, Weston General Hospital, Weston-Super-Mare, UK
2. Department of General Surgery, University Hospital of Wales, Cardiff, UK
3. School of Medicine, Imperial College London, London, UK
4. Department of General Surgery, University Hospital Coventry & Warwickshire, Coventry, UK
5. Department of Hepatobiliary and Pancreatic Surgery, Manchester Royal Infirmary Hospital, Manchester, UK