1. Liverpool Vascular and Endovascular Service, Royal Liverpool University Hospital & University Hospital Aintree, Liverpool, UK
2. Department of General Surgery, University Hospital of Heraklion, University of Crete, Heraklion, Greece
3. Library Resource & Information Centre, University Hospital Aintree, Liverpool, UK
4. Department of Vascular and Endovascular Surgery, The Royal Oldham Hospital, The Pennine Acute Hospitals NHS Trust, Manchester, UK