1. The Royal Oldham Hospital, Pennine Acute Hospitals NHS Trust; Department of Vascular and Endovascular Surgery; Manchester UK
2. University Hospital of Alexandroupolis, Democritus University of Thrace; Department of Vascular and Endovascular Surgery; Alexandroupolis Greece
3. University Hospital of Heraklion, University of Crete; Department of Surgery; Souniou 11 Heraklion Greece 19001
4. Royal Liverpool University Hospital; Liverpool Vascular and Endovascular Service; Prescot Street Liverpool UK L7 8XP