1. Department of Surgery, East Lancashire NHS Trust, Blackburn, UK
2. Department of Vascular Surgery, Swansea Bay University Health Board, Swansea, UK
3. Department of Orthopaedic Surgery, University of Edinburgh, Edinburgh, UK
4. Department of Surgery, University of Leeds, Leeds, UK
5. Department of Surgery, Northwick Park Hospital, Harrow, UK
6. Department of Vascular Surgery, University Hospital Southampton NHS Foundation Trust, Southampton, UK
7. Department of Surgery, University of Manchester, Salford Royal NHS Foundation Trust, Salford, UK